https://github.com/antonialoytorrens/idesk/pull/1
https://github.com/neagix/idesk/pull/9
https://github.com/neagix/idesk/issues/7

From b13626bbe2669b8a267ad53df93f1060379a462e Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Fri, 15 Jul 2022 08:22:12 +0100
Subject: [PATCH] build: use pkg-config to find imlib2

imlib2 1.7.5+ drops imlib2-config, hence pkg-config
must now be used to find it.

Bug: https://bugs.gentoo.org/828962
--- a/configure.in
+++ b/configure.in
@@ -94,19 +94,10 @@ LIBS="$LIBS $Xext_lib"
 
 dnl Imlib2 detection
 
-AC_PATH_GENERIC(imlib2, , [
-    AC_SUBST(IMLIB_LIBS)
-   AC_SUBST(IMLIB_CXXFLAGS) ],
-  AC_MSG_ERROR(Cannot find imlib2: Is imlib2-config in the path?
-               You need Imlib2 to build Idesk.  Verify that you have Imlib2-dev))
-
-dnl the above doesn't work for some reason :/
-IMLIB_LIBS=`imlib2-config --libs`
-IMLIB_CFLAGS=`imlib2-config --cflags`
-AC_SUBST(IMLIB_LIBS)
-AC_SUBST(IMLIB_CXXFLAGS)
-
-CXXFLAGS="$CXXFLAGS $IMLIB_CXXFLAGS"
+PKG_PROG_PKG_CONFIG
+PKG_CHECK_MODULES([IMLIB], [imlib2 > 1.0])
+
+CXXFLAGS="$CXXFLAGS $IMLIB_CFLAGS"
 LIBS="$LIBS $IMLIB_LIBS"