https://bugs.gentoo.org/929027
https://github.com/ruven/iipsrv/commit/0d16fc300c809aafea5d8cd1ec39cdc1f7d47ec7
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -460,7 +460,7 @@ if test "$TIFF_LIBS" = ""; then
 	INCLUDES="$TIFF_INCLUDES $INCLUDES"
 
 	# Try the standard search path first
-	AC_TRY_LINK([#include <tiff.h>],[TIFFGetVersion();], [
+	AC_TRY_LINK([#include <tiffio.h>],[TIFFGetVersion();], [
 		TIFF_LIBS="-ltiff"
 	], [
 		# libtiff is not in the standard search path.