added pkgconfig

src/build.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env nix-shell
 #! nix-shell -i bash
-#! nix-shell -p bash curl gcc zlib libffi icu77 python314 rustc ccache ninja cmake libllvm cargo rust-cbindgen
+#! nix-shell -p bash curl gcc zlib libffi icu77 python314 rustc ccache ninja cmake libllvm cargo rust-cbindgen pkg-config
 SUBVERSION="140.4.0"
 VERSION="${SUBVERSION}esr"
 DOWNLOAD="https://ftp.mozilla.org/pub/firefox/releases/$VERSION/source/firefox-$VERSION.source.tar.xz"