diff --git a/pkgs/intel-oneapi/patch_intel.nix b/pkgs/intel-oneapi/patch_intel.nix
index b5cde4d..d5427dc 100644
--- a/pkgs/intel-oneapi/patch_intel.nix
+++ b/pkgs/intel-oneapi/patch_intel.nix
@@ -46,6 +46,12 @@ let
     in (wrapCCWith {
       inherit cc;
       extraBuildCommands = ''
+        echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
+        echo "-L${gcc.cc.lib}/lib" >> $out/nix-support/cc-ldflags
+        echo "-L${cc}/lib" >> $out/nix-support/cc-ldflags
+
+        echo "--gcc-toolchain=${gcc.cc}" >> $out/nix-support/cc-cflags
+
         # For some reason, If we don't resolve the realpath things go wrong
         for stddef in ${cc}/lib/clang/*/include/stddef.h ; do
           dir=$(dirname $(realpath "$stddef"))
@@ -55,11 +61,9 @@ let
         echo "-isystem ${cc}/include" >> $out/nix-support/cc-cflags
         echo "-isystem ${cc}/include/intel64" >> $out/nix-support/cc-cflags
 
-        echo "-L${gcc.cc}/lib/gcc/${targetConfig}/${gcc.version}" >> $out/nix-support/cc-ldflags
-        echo "-L${gcc.cc.lib}/lib" >> $out/nix-support/cc-ldflags
-        echo "-L${cc}/lib" >> $out/nix-support/cc-ldflags
-
-        echo "--gcc-toolchain=${gcc.cc}" >> $out/nix-support/libcxx-cxxflags
+        for dir in ${gcc.cc}/lib/gcc/${targetConfig}/*/include; do
+          echo "-isystem $dir" >> $out/nix-support/cc-cflags
+        done
 
         for dir in ${gcc.cc}/include/c++/*; do
           echo "-isystem $dir" >> $out/nix-support/libcxx-cxxflags