diff -Paur --no-dereference -- libcairo.upstream/configure libcairo/configure
--- libcairo.upstream/configure
+++ libcairo/configure
@@ -33026,7 +33026,7 @@
 
 
 
-if pkg-config --exists 'pixman-1 >= 0.27.1'; then
+if ${PKG_CONFIG:-pkg-config} --exists 'pixman-1 >= 0.27.1'; then
 
 $as_echo "#define HAS_PIXMAN_GLYPHS 1" >>confdefs.h
 
