--- libgd-2.2.0/configure.ac.orig	2016-05-20 17:39:09.000000000 +0200
+++ libgd-2.2.0/configure.ac	2016-05-20 17:39:59.000000000 +0200
@@ -41,7 +41,7 @@
 dnl This isn't 100% correct, but it tends to be a close enough approximation
 dnl for how we manage the codebase.  It's rare to do a release that doesn't
 dnl modify the library since this project is centered around the library.
-GDLIB_LT_REVISION=$(printf '%i%02i%02i' $GDLIB_MAJOR $GDLIB_MINOR $GDLIB_REVISION)
+GDLIB_LT_REVISION="$(($GDLIB_MAJOR << 8 | $GDLIB_MINOR << 4 | $GDLIB_REVISION))"
 GDLIB_LT_AGE=0
 AC_SUBST(GDLIB_LT_CURRENT)
 AC_SUBST(GDLIB_LT_REVISION)