diff --git a/pkgs/development/libraries/aws-sdk-cpp/default.nix b/pkgs/development/libraries/aws-sdk-cpp/default.nix
index efe8129d3b4f6..25fa023abd7d8 100644
--- a/pkgs/development/libraries/aws-sdk-cpp/default.nix
+++ b/pkgs/development/libraries/aws-sdk-cpp/default.nix
@@ -92,6 +92,8 @@ stdenv.mkDerivation rec {
 
   # propagation is needed for Security.framework to be available when linking
   propagatedBuildInputs = [ aws-crt-cpp ];
+  # Ensure the linker is using atomic when compiling for RISC-V, otherwise fails
+  LDFLAGS = lib.optionalString stdenv.hostPlatform.isRiscV "-latomic";
 
   cmakeFlags = [
     "-DBUILD_DEPS=OFF"
diff --git a/pkgs/development/libraries/nlohmann_json/default.nix b/pkgs/development/libraries/nlohmann_json/default.nix
index 70699db418ad1..3c8244c755320 100644
--- a/pkgs/development/libraries/nlohmann_json/default.nix
+++ b/pkgs/development/libraries/nlohmann_json/default.nix
@@ -24,7 +24,8 @@ in stdenv.mkDerivation (finalAttrs: {
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = [
-    "-DBuildTests=${if finalAttrs.doCheck then "ON" else "OFF"}"
+    "-DJSON_BuildTests=${if finalAttrs.doCheck then "ON" else "OFF"}"
+    "-DJSON_FastTests=ON"
     "-DJSON_MultipleHeaders=ON"
   ] ++ lib.optional finalAttrs.doCheck "-DJSON_TestDataDirectory=${testData}";
 
diff --git a/pkgs/top-level/release-lib.nix b/pkgs/top-level/release-lib.nix
index 45874d33b0f22..38e6f8072776c 100644
--- a/pkgs/top-level/release-lib.nix
+++ b/pkgs/top-level/release-lib.nix
@@ -27,6 +27,7 @@ rec {
     pkgs_x86_64_linux = packageSet' { system = "x86_64-linux"; };
     pkgs_i686_linux = packageSet' { system = "i686-linux"; };
     pkgs_aarch64_linux = packageSet' { system = "aarch64-linux"; };
+    pkgs_riscv64_linux = packageSet' { system = "riscv64-linux"; };
     pkgs_aarch64_darwin = packageSet' { system = "aarch64-darwin"; };
     pkgs_armv6l_linux = packageSet' { system = "armv6l-linux"; };
     pkgs_armv7l_linux = packageSet' { system = "armv7l-linux"; };
@@ -40,6 +41,7 @@ rec {
       if system == "x86_64-linux" then pkgs_x86_64_linux
       else if system == "i686-linux" then pkgs_i686_linux
       else if system == "aarch64-linux" then pkgs_aarch64_linux
+      else if system == "riscv64-linux" then pkgs_riscv64_linux
       else if system == "aarch64-darwin" then pkgs_aarch64_darwin
       else if system == "armv6l-linux" then pkgs_armv6l_linux
       else if system == "armv7l-linux" then pkgs_armv7l_linux