ref: 6e5a28226b0c6ce33f3a8df32c028b1f89b9ca00 dir: /GNUmakefile/
# GNU Make 3.x doesn't support the "!=" shell syntax, so here's an alternative PKG_CONFIG = pkg-config PNGFLAGS = $(shell ${PKG_CONFIG} --cflags libpng) include Makefile