diff --git a/etc/profile.sh b/etc/profile.sh
index 2e533a7457f..1ac34ed4fb8 100644
--- a/etc/profile.sh
+++ b/etc/profile.sh
@@ -55,6 +55,7 @@ NIX_PROFILES="/nix/var/nix/profiles/default $NIX_USER_PROFILE_DIR/profile"
 for i in $NIX_PROFILES; do # !!! reverse
     export PATH=$i/bin:$i/sbin:$PATH
     export INFOPATH=$i/info:$i/share/info:$INFOPATH
+    export PKG_CONFIG_PATH="$i/lib/pkgconfig:$PKG_CONFIG_PATH"
 done
 
 # Search directory for Aspell dictionaries.