Issue #10651 has been reported by Anatol Pomozov. ---------------------------------------- Bug #10651: pkg_config does not report required include headers https://bugs.ruby-lang.org/issues/10651 * Author: Anatol Pomozov * Status: Open * Priority: Normal * Assignee: * Category: * Target version: * ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-linux] * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN ---------------------------------------- pkg_config behavior seems incorrect in 2.2.0. I am testing following script in Linux Arch: `require 'mkmf' puts pkg_config("xft")` In 2.1.5 it gives `["-I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz", "", "-lXft"]` In 2.2.0 it gives `["", "", "-lXft"]` pkg-config command line tool gives. `$ pkg-config --cflags xft -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz` So it points that new pkg_config implementation is incorrect. Here is content of the pc file itself: $ cat /usr/lib/pkgconfig/xft.pc prefix=/usr exec_prefix=${prefix} libdir=${exec_prefix}/lib includedir=${prefix}/include Name: Xft Description: X FreeType library Version: 2.3.2 Requires: xproto Requires.private: xrender, fontconfig, freetype2 Cflags: -I${includedir} Libs: -L${libdir} -lXft -- https://bugs.ruby-lang.org/