diff --git a/pkgs/development/compilers/gcc/4.3/default.nix b/pkgs/development/compilers/gcc/4.3/default.nix
index 3db8ee5f3ea7..e97ae93cd531 100644
--- a/pkgs/development/compilers/gcc/4.3/default.nix
+++ b/pkgs/development/compilers/gcc/4.3/default.nix
@@ -143,7 +143,7 @@ stdenv.mkDerivation ({
   postConfigure = ''
     make configure-gcc
     sed -i gcc/Makefile -e 's@^CFLAGS = .*@& -I${zlib}/include@ ; s@^LDFLAGS = .*@& -L${zlib}/lib@'
-    sed -i gcc/Makefile -e 's@^CFLAGS = .*@& -I${boehmgc}/include@ ; s@^LDFLAGS = .*@& -L${boehmgc}/lib -lgc@'
+    sed -i gcc/Makefile -e 's@^CFLAGS = .*@& -I${boehmgc}/include@ ; s@^LDFLAGS = .*@& -L${boehmgc.out}/lib -lgc@'
   '';
 } else {})
 // (if langVhdl then rec {
diff --git a/pkgs/development/compilers/opendylan/bin.nix b/pkgs/development/compilers/opendylan/bin.nix
index 4d18b8d328d6..492b1c4b3338 100644
--- a/pkgs/development/compilers/opendylan/bin.nix
+++ b/pkgs/development/compilers/opendylan/bin.nix
@@ -24,10 +24,10 @@ stdenv.mkDerivation {
     interpreter="$(cat "$NIX_CC"/nix-support/dynamic-linker)"
     for a in "$out"/bin/*; do 
       patchelf --set-interpreter "$interpreter" "$a"
-      patchelf --set-rpath "$out/lib:${boehmgc}/lib" "$a"
+      patchelf --set-rpath "$out/lib:${boehmgc.out}/lib" "$a"
     done
     for a in "$out"/lib/*.so; do 
-      patchelf --set-rpath "$out/lib:${boehmgc}/lib" "$a"
+      patchelf --set-rpath "$out/lib:${boehmgc.out}/lib" "$a"
     done
     sed -i -e "s|\-lgc|\-L${boehmgc}\/lib -lgc|" $out/lib/config.jam
     wrapProgram $out/bin/dylan-compiler --suffix PATH : ${gcc}/bin