set -x export NIX_DEBUG=1 . $stdenv/setup export NIX_ENFORCE_PURITY=1 mkdir $out mkdir $out/bin cat > hello.c < int main(int argc, char * * argv) { printf("Hello World!\n"); return 0; } EOF #gcc -I/nix/store/foo -I /nix/store/foo -I/usr/lib -I /usr/lib hello.c -o $out/bin/hello gcc -I`pwd` -L /nix/store/abcd/lib -isystem /usr/lib hello.c -o $out/bin/hello $out/bin/hello cat > hello2.cc < int main(int argc, char * * argv) { std::cout << "Hello World!\n"; std::cout << VALUE << std::endl; return 0; } EOF g++ hello2.cc -o $out/bin/hello2 -DVALUE="1 + 2 * 3" $out/bin/hello2 ld -v