From f15c066fd96c9e1b12930f3a5e79c48dedd9e54f Mon Sep 17 00:00:00 2001
From: Lars Eggert <lars@eggert.org>
Date: Tue, 17 Sep 2024 17:31:50 +0300
Subject: [PATCH] NSS_PREBUILT

---
 .github/actions/nss/action.yml | 1 +
 neqo-crypto/build.rs           | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/.github/actions/nss/action.yml b/.github/actions/nss/action.yml
index 31e3b15d17..d0d1b172bd 100644
--- a/.github/actions/nss/action.yml
+++ b/.github/actions/nss/action.yml
@@ -179,6 +179,7 @@ runs:
         echo "DYLD_FALLBACK_LIBRARY_PATH=$NSS_OUT/lib" >> "$GITHUB_ENV"
         echo "$NSS_OUT/lib" >> "$GITHUB_PATH"
         echo "NSS_DIR=$NSS_DIR" >> "$GITHUB_ENV"
+        echo "NSS_PREBUILT=1" >> "$GITHUB_ENV"
       env:
         NSS_DIR: ${{ github.workspace }}/nss
         NSPR_DIR: ${{ github.workspace }}/nspr
diff --git a/neqo-crypto/build.rs b/neqo-crypto/build.rs
index 34cc842b5e..69ab267f6b 100644
--- a/neqo-crypto/build.rs
+++ b/neqo-crypto/build.rs
@@ -317,7 +317,10 @@ fn setup_standalone(nss: &str) -> Vec<String> {
         "The NSS_DIR environment variable is expected to be an absolute path."
     );
 
-    build_nss(nss.clone());
+    // If NSS_PREBUILT is set, we assume that the NSS libraries are already built.
+    if env::var("NSS_PREBUILT").unwrap_or_default() != "1" {
+        build_nss(nss.clone());
+    }
 
     // $NSS_DIR/../dist/
     let nssdist = nss.parent().unwrap().join("dist");