INSTALL: Add pkg-config to the list of build requirements.

nmlgc · nmlgc · commit df8dbaee41c8 · 2015-07-08T23:44:21.000+02:00
Which you might not already have on Cygwin.
diff --git a/INSTALL b/INSTALL
@@ -4,6 +4,7 @@ Build requirements:
 	[if building from repository] flex >=2.5.31
 	[if building from repository] bison
 	[if building from repository] libtool >=2.4
+	[if building from repository] pkg-config
 	zlib
 	libpng
 	Recent GCC
