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-rw-r--r--pkgs/stdenv/generic/setup.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index fe801c6bb971..987d7766ce89 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -386,7 +386,7 @@ substituteAll() {
     local output="$2"
 
     # Select all environment variables that start with a lowercase character.
-    for envVar in $(env | sed "s/^[^a-z].*//" | sed "s/^\([^=]*\)=.*/\1/"); do
+    for envVar in $(env | sed -e $'s/^\([a-z][^=]*\)=.*/\\1/; t \n d'); do
         if [ "$NIX_DEBUG" = "1" ]; then
             echo "$envVar -> ${!envVar}"
         fi