diff --git a/GNUMakefile b/GNUMakefile
new file mode 100644
index 00000000..9650e67f
--- /dev/null
+++ b/GNUMakefile
@@ -0,0 +1,6 @@
+# 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