diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9608085c7..8006fe20f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [v0.2.1] - 2020-06-30
+
+- Disabled `powerpc64-unknown-linux-gnu` image.
+- Disabled `sparc64-unknown-linux-gnu` image.
 - Disabled `x86_64-unknown-dragonfly` image.
 - Removed CI testing for `i686-apple-darwin`.
 
@@ -224,7 +228,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 - Initial release. Supports 12 targets.
 
-[Unreleased]: https://github.com/rust-embedded/cross/compare/v0.2.0...HEAD
+[Unreleased]: https://github.com/rust-embedded/cross/compare/v0.2.1...HEAD
+[v0.2.1]: https://github.com/rust-embedded/cross/compare/v0.2.0...v0.2.1
 [v0.2.0]: https://github.com/rust-embedded/cross/compare/v0.1.16...v0.2.0
 [v0.1.16]: https://github.com/rust-embedded/cross/compare/v0.1.15...v0.1.16
 [v0.1.15]: https://github.com/rust-embedded/cross/compare/v0.1.14...v0.1.15
diff --git a/Cargo.lock b/Cargo.lock
index 29f63d8a2..cc528539f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,33 +1,39 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 [[package]]
-name = "atty"
-version = "0.2.14"
+name = "addr2line"
+version = "0.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hermit-abi 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "gimli 0.21.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "backtrace"
-version = "0.3.44"
+name = "adler32"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "atty"
+version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "backtrace-sys"
-version = "0.1.32"
+name = "backtrace"
+version = "0.3.49"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "addr2line 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "miniz_oxide 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "object 0.20.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -37,7 +43,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cc"
-version = "1.0.50"
+version = "1.0.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -47,21 +53,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cross"
-version = "0.2.0"
+version = "0.2.1"
 dependencies = [
  "atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "home 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.48 (registry+https://github.com/rust-lang/crates.io-index)",
- "shell-escape 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shell-escape 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "which 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "which 3.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -69,16 +75,21 @@ name = "error-chain"
 version = "0.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.44 (registry+https://github.com/rust-lang/crates.io-index)",
- "version_check 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.49 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "hermit-abi"
-version = "0.1.7"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -86,12 +97,12 @@ name = "home"
 version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "itoa"
-version = "0.4.5"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -101,21 +112,34 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.67"
+version = "0.2.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "miniz_oxide"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "adler32 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "nix"
 version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "object"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.16"
@@ -131,7 +155,7 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "1.0.2"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -149,22 +173,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.104"
+version = "1.0.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde_json"
-version = "1.0.48"
+version = "1.0.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "itoa 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "ryu 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "shell-escape"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -172,12 +196,12 @@ name = "toml"
 version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "version_check"
-version = "0.9.1"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -187,15 +211,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "which"
-version = "3.1.0"
+version = "3.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "winapi"
-version = "0.3.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -213,31 +237,35 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
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+"checksum winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index 7de9b652f..072d0a6c7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ keywords = ["cross", "compilation", "testing", "tool"]
 license = "MIT OR Apache-2.0"
 name = "cross"
 repository = "https://github.com/rust-embedded/cross"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2018"
 
 [dependencies]
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 0cffdfe09..863d08497 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -30,11 +30,11 @@ jobs:
         mips64-unknown-linux-gnuabi64:   { TARGET: mips64-unknown-linux-gnuabi64,   CPP: 1, DYLIB: 1, STD: 1, RUN: 1 }
         mips64el-unknown-linux-gnuabi64: { TARGET: mips64el-unknown-linux-gnuabi64, CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: qemu-user qemu-system }
         powerpc-unknown-linux-gnu:       { TARGET: powerpc-unknown-linux-gnu,       CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: qemu-user qemu-system }
-        powerpc64-unknown-linux-gnu:     { TARGET: powerpc64-unknown-linux-gnu,     CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: qemu-user qemu-system }
+      # powerpc64-unknown-linux-gnu:     { TARGET: powerpc64-unknown-linux-gnu,     CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: qemu-user qemu-system }
         powerpc64le-unknown-linux-gnu:   { TARGET: powerpc64le-unknown-linux-gnu,   CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: qemu-user qemu-system }
         riscv64gc-unknown-linux-gnu:     { TARGET: riscv64gc-unknown-linux-gnu,     CPP: 1,           STD: 1, RUN: 1 }
         s390x-unknown-linux-gnu:         { TARGET: s390x-unknown-linux-gnu,         CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: qemu-system }
-        sparc64-unknown-linux-gnu:       { TARGET: sparc64-unknown-linux-gnu,       CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: qemu-system }
+      # sparc64-unknown-linux-gnu:       { TARGET: sparc64-unknown-linux-gnu,       CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: qemu-system }
         x86_64-unknown-linux-gnu:        { TARGET: x86_64-unknown-linux-gnu,        CPP: 1, DYLIB: 1, STD: 1, RUN: 1, RUNNERS: native qemu-user qemu-system, DEPLOY: 1, CRATES_IO_PUBLISH: 1 }
         aarch64-unknown-linux-musl:      { TARGET: aarch64-unknown-linux-musl,                        STD: 1, RUN: 1 }
         arm-unknown-linux-musleabihf:    { TARGET: arm-unknown-linux-musleabihf,                      STD: 1, RUN: 1 }
@@ -81,7 +81,7 @@ jobs:
       - bash: echo "##vso[task.setvariable variable=TAG]${BUILD_SOURCEBRANCH##refs/tags/}"
         displayName: Set TAG Variable
         condition: startsWith(variables['Build.SourceBranch'], 'refs/tags/')
-      - bash: cargo test 
+      - bash: cargo test
         displayName: Run unit tests
         timeoutInMinutes: 5
       - bash: ./build-docker-image.sh "${TARGET}"
diff --git a/ci/azure-install-rust.yml b/ci/azure-install-rust.yml
index 4a9619860..ad9dbc6e8 100644
--- a/ci/azure-install-rust.yml
+++ b/ci/azure-install-rust.yml
@@ -13,7 +13,9 @@ steps:
           rustup self update
         fi
       else
-        curl -sSL https://sh.rustup.rs | sh -s -- -y --default-toolchain="$TOOLCHAIN" --profile=minimal
+        curl --retry 3 -sSfL https://sh.rustup.rs -o rustup-init.sh
+        sh rustup-init.sh -y --default-toolchain="$TOOLCHAIN" --profile=minimal
+        rm rustup-init.sh
         echo "##vso[task.prependpath]$HOME/.cargo/bin"
       fi
     displayName: Install rustup
diff --git a/docker/Dockerfile.arm-unknown-linux-gnueabihf b/docker/Dockerfile.arm-unknown-linux-gnueabihf
index 65b6d71ad..6aa7f2aeb 100644
--- a/docker/Dockerfile.arm-unknown-linux-gnueabihf
+++ b/docker/Dockerfile.arm-unknown-linux-gnueabihf
@@ -9,10 +9,12 @@ RUN /cmake.sh
 COPY xargo.sh /
 RUN /xargo.sh
 
-RUN mkdir /usr/arm-linux-gnueabihf && \
-    cd /usr/arm-linux-gnueabihf && \
-    curl -L https://developer.arm.com/-/media/Files/downloads/gnu-a/8.3-2019.03/binrel/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf.tar.xz | \
-    tar --strip-components 1 -xJ
+RUN mkdir /usr/arm-linux-gnueabihf \
+ && cd /usr/arm-linux-gnueabihf \
+ && export TOOLCHAIN_VERSION=8.3-2019.03 \
+ && curl --retry 3 -sSfL https://developer.arm.com/-/media/Files/downloads/gnu-a/${TOOLCHAIN_VERSION}/binrel/gcc-arm-${TOOLCHAIN_VERSION}-x86_64-arm-linux-gnueabihf.tar.xz -O \
+ && tar --strip-components 1 -xJf gcc-arm-${TOOLCHAIN_VERSION}-x86_64-arm-linux-gnueabihf.tar.xz \
+ && rm gcc-arm-${TOOLCHAIN_VERSION}-x86_64-arm-linux-gnueabihf.tar.xz
 
 ENV PATH /usr/arm-linux-gnueabihf/bin:$PATH
 
diff --git a/docker/android-ndk.sh b/docker/android-ndk.sh
index 9d8a2f07d..c5668ff3d 100755
--- a/docker/android-ndk.sh
+++ b/docker/android-ndk.sh
@@ -28,7 +28,7 @@ main() {
     td="$(mktemp -d)"
 
     pushd "${td}"
-    curl -O "${NDK_URL}"
+    curl --retry 3 -sSfL "${NDK_URL}" -O
     unzip -q android-ndk-*.zip
     pushd android-ndk-*
     ./build/tools/make_standalone_toolchain.py \
diff --git a/docker/android-system.sh b/docker/android-system.sh
index 78cb7f242..1a0eca10b 100755
--- a/docker/android-system.sh
+++ b/docker/android-system.sh
@@ -50,7 +50,7 @@ EOF
         fi
     done
 
-    curl -O https://storage.googleapis.com/git-repo-downloads/repo
+    curl --retry 3 -sSfL https://storage.googleapis.com/git-repo-downloads/repo -O
     chmod +x repo
 
     # this is the minimum set of modules that are need to build bionic
diff --git a/docker/cmake.sh b/docker/cmake.sh
index cd40f5c47..d16a41e44 100755
--- a/docker/cmake.sh
+++ b/docker/cmake.sh
@@ -22,7 +22,7 @@ main() {
 
     pushd "${td}"
 
-    curl -sSfL "https://github.com/Kitware/CMake/releases/download/v${version}/cmake-${version}-Linux-x86_64.sh" -o cmake.sh
+    curl --retry 3 -sSfL "https://github.com/Kitware/CMake/releases/download/v${version}/cmake-${version}-Linux-x86_64.sh" -o cmake.sh
     sh cmake.sh --skip-license --prefix=/usr/local
 
     popd
diff --git a/docker/Dockerfile.powerpc64-unknown-linux-gnu b/docker/disabled/Dockerfile.powerpc64-unknown-linux-gnu
similarity index 100%
rename from docker/Dockerfile.powerpc64-unknown-linux-gnu
rename to docker/disabled/Dockerfile.powerpc64-unknown-linux-gnu
diff --git a/docker/Dockerfile.sparc64-unknown-linux-gnu b/docker/disabled/Dockerfile.sparc64-unknown-linux-gnu
similarity index 100%
rename from docker/Dockerfile.sparc64-unknown-linux-gnu
rename to docker/disabled/Dockerfile.sparc64-unknown-linux-gnu
diff --git a/docker/disabled/dragonfly.sh b/docker/disabled/dragonfly.sh
index e8e9f477a..43b64d670 100755
--- a/docker/disabled/dragonfly.sh
+++ b/docker/disabled/dragonfly.sh
@@ -35,11 +35,11 @@ main() {
 
     mkdir "${td}"/{binutils,gcc}{,-build} "${td}/dragonfly"
 
-    curl "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.bz2" | \
-        tar -C "${td}/binutils" --strip-components=1 -xj
+    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.bz2" -O
+    tar -C "${td}/binutils" --strip-components=1 -xjf "binutils-${binutils}.tar.bz2"
 
-    curl "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.bz2" | \
-        tar -C "${td}/gcc" --strip-components=1 -xj
+    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.bz2" -O
+    tar -C "${td}/gcc" --strip-components=1 -xjf "gcc-${gcc}.tar.bz2"
 
     pushd "${td}"
 
@@ -90,9 +90,8 @@ EOF
 EOF
     cd ..
 
-    curl "https://mirror-master.dragonflybsd.org/iso-images/dfly-x86_64-${dragonfly}.iso.bz2" | \
-        bzcat | \
-        bsdtar xf - -C "${td}/dragonfly" ./usr/include ./usr/lib ./lib
+    curl --retry 3 -sSfL "https://mirror-master.dragonflybsd.org/iso-images/dfly-x86_64-${dragonfly}.iso.bz2" -O
+    bzcat "dfly-x86_64-${dragonfly}.iso.bz2" | bsdtar xf - -C "${td}/dragonfly" ./usr/include ./usr/lib ./lib
 
     cd binutils-build
     ../binutils/configure \
diff --git a/docker/dropbear.sh b/docker/dropbear.sh
index dd6b2f285..0c9fffc4d 100755
--- a/docker/dropbear.sh
+++ b/docker/dropbear.sh
@@ -4,7 +4,7 @@ set -x
 set -euo pipefail
 
 main() {
-    local version=2019.78
+    local version=2020.80
 
     local dependencies=(
         autoconf
@@ -29,8 +29,8 @@ main() {
 
     pushd "${td}"
 
-    curl -L "https://matt.ucc.asn.au/dropbear/dropbear-${version}.tar.bz2" | \
-        tar --strip-components=1 -xj
+    curl --retry 3 -sSfL "https://matt.ucc.asn.au/dropbear/dropbear-${version}.tar.bz2" -O
+    tar --strip-components=1 -xjf "dropbear-${version}.tar.bz2"
 
     # Remove some unwanted message
     sed -i '/skipping hostkey/d' cli-kex.c
diff --git a/docker/freebsd.sh b/docker/freebsd.sh
index 83a6af69e..b1ab3a5bc 100755
--- a/docker/freebsd.sh
+++ b/docker/freebsd.sh
@@ -34,11 +34,11 @@ main() {
 
     mkdir "${td}"/{binutils,gcc}{,-build} "${td}/freebsd"
 
-    curl "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.bz2" | \
-        tar -C "${td}/binutils" --strip-components=1 -xj
+    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.bz2" -O
+    tar -C "${td}/binutils" --strip-components=1 -xjf "binutils-${binutils}.tar.bz2"
 
-    curl "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.bz2" | \
-        tar -C "${td}/gcc" --strip-components=1 -xj
+    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.bz2" -O
+    tar -C "${td}/gcc" --strip-components=1 -xjf "gcc-${gcc}.tar.bz2"
 
     pushd "${td}"
 
@@ -57,8 +57,8 @@ main() {
             ;;
     esac
 
-    curl "http://ftp.freebsd.org/pub/FreeBSD/releases/${bsd_arch}/10.2-RELEASE/base.txz" | \
-        tar -C "${td}/freebsd" -xJ ./usr/include ./usr/lib ./lib
+    curl --retry 3 -sSfL "http://ftp.freebsd.org/pub/FreeBSD/releases/${bsd_arch}/10.2-RELEASE/base.txz" -O
+    tar -C "${td}/freebsd" -xJf base.txz ./usr/include ./usr/lib ./lib
 
     cd binutils-build
     ../binutils/configure \
diff --git a/docker/musl.sh b/docker/musl.sh
index 87f6ac42b..28ad2164d 100755
--- a/docker/musl.sh
+++ b/docker/musl.sh
@@ -19,6 +19,8 @@ hide_output() {
 }
 
 main() {
+    local version=0.9.8
+
     local dependencies=(
         ca-certificates
         curl
@@ -38,13 +40,13 @@ main() {
     td="$(mktemp -d)"
 
     pushd "${td}"
-    curl -L https://github.com/richfelker/musl-cross-make/archive/v0.9.8.tar.gz | \
-        tar --strip-components=1 -xz
+    curl --retry 3 -sSfL "https://github.com/richfelker/musl-cross-make/archive/v${version}.tar.gz" -O
+    tar --strip-components=1 -xzf "v${version}.tar.gz"
 
     hide_output make install "-j$(nproc)" \
         GCC_VER=6.4.0 \
         MUSL_VER=1.1.22 \
-        DL_CMD='curl -C - -L -o' \
+        DL_CMD='curl --retry 3 -sSfL -C - -o' \
         OUTPUT=/usr/local/ \
         "${@}"
 
diff --git a/docker/netbsd.sh b/docker/netbsd.sh
index e34e07862..6447c702c 100755
--- a/docker/netbsd.sh
+++ b/docker/netbsd.sh
@@ -33,11 +33,11 @@ main() {
 
     mkdir "${td}"/{binutils,gcc}{,-build} "${td}/netbsd"
 
-    curl "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.bz2" | \
-        tar -C "${td}/binutils" --strip-components=1 -xj
+    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.bz2" -O
+    tar -C "${td}/binutils" --strip-components=1 -xjf "binutils-${binutils}.tar.bz2"
 
-    curl "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.bz2" | \
-        tar -C "${td}/gcc" --strip-components=1 -xj
+    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.bz2" -O
+    tar -C "${td}/gcc" --strip-components=1 -xjf "gcc-${gcc}.tar.bz2"
 
     pushd "${td}"
 
@@ -51,16 +51,19 @@ main() {
 
     local patch
     for patch in "${patches[@]}"; do
-        patch="$(curl "${patch}")"
-        echo "${patch}" | patch -Np0
+        local patch_file
+        patch_file="$(mktemp)"
+        curl --retry 3 -sSfL "${patch}" -o "${patch_file}"
+        patch -Np0 < "${patch_file}"
+        rm "${patch_file}"
     done
     cd ..
 
-    curl ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-7.0/amd64/binary/sets/base.tgz | \
-        tar -C "${td}/netbsd" -xz ./usr/include ./usr/lib ./lib
+    curl --retry 3 -sSfL ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-7.0/amd64/binary/sets/base.tgz -O
+    tar -C "${td}/netbsd" -xzf base.tgz ./usr/include ./usr/lib ./lib
 
-    curl ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-7.0/amd64/binary/sets/comp.tgz | \
-        tar -C "${td}/netbsd" -xz ./usr/include ./usr/lib
+    curl --retry 3 -sSfL ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-7.0/amd64/binary/sets/comp.tgz -O
+    tar -C "${td}/netbsd" -xzf comp.tgz ./usr/include ./usr/lib
 
     cd binutils-build
     ../binutils/configure \
diff --git a/docker/qemu.sh b/docker/qemu.sh
index 310b15d32..747fcaa55 100755
--- a/docker/qemu.sh
+++ b/docker/qemu.sh
@@ -53,8 +53,8 @@ main() {
 
     pushd "${td}"
 
-    curl -L "https://download.qemu.org/qemu-${version}.tar.xz" | \
-        tar --strip-components=1 -xJ
+    curl --retry 3 -sSfL "https://download.qemu.org/qemu-${version}.tar.xz" -O
+    tar --strip-components=1 -xJf "qemu-${version}.tar.xz"
 
    local targets="${arch}-linux-user"
    local virtfs=""
diff --git a/docker/solaris.sh b/docker/solaris.sh
index fad0c0101..126867f60 100755
--- a/docker/solaris.sh
+++ b/docker/solaris.sh
@@ -36,11 +36,11 @@ main() {
 
     mkdir "${td}"/{binutils,gcc}{,-build} "${td}/solaris"
 
-    curl "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.xz" | \
-        tar -C "${td}/binutils" --strip-components=1 -xJ
+    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/binutils/binutils-${binutils}.tar.xz" -O
+    tar -C "${td}/binutils" --strip-components=1 -xJf "binutils-${binutils}.tar.xz"
 
-    curl "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.xz" | \
-        tar -C "${td}/gcc" --strip-components=1 -xJ
+    curl --retry 3 -sSfL "https://ftp.gnu.org/gnu/gcc/gcc-${gcc}/gcc-${gcc}.tar.xz" -O
+    tar -C "${td}/gcc" --strip-components=1 -xJf "gcc-${gcc}.tar.xz"
 
     pushd "${td}"
 
diff --git a/docker/xargo.sh b/docker/xargo.sh
index 0ea69d00c..c349d96d8 100755
--- a/docker/xargo.sh
+++ b/docker/xargo.sh
@@ -21,7 +21,7 @@ main() {
     export RUSTUP_HOME=/tmp/rustup
     export CARGO_HOME=/tmp/cargo
 
-    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs -o rustup-init.sh
+    curl --retry 3 -sSfL https://sh.rustup.rs -o rustup-init.sh
     sh rustup-init.sh -y --no-modify-path --profile minimal
     rm rustup-init.sh