AC_PATH_PROG does not search tuple prefixes.
--- a/config-scripts/cups-common.m4
+++ b/config-scripts/cups-common.m4
@@ -37,15 +37,15 @@ AC_PROG_CC(clang cc gcc)
 AC_PROG_CPP
 AC_PROG_CXX(clang++ c++ g++)
 AC_PROG_RANLIB
-AC_PATH_PROG(AR,ar)
+AC_CHECK_TOOL(AR,ar)
 AC_PATH_PROG(CHMOD,chmod)
 AC_PATH_PROG(GZIPPROG,gzip)
 AC_MSG_CHECKING(for install-sh script)
 INSTALL="`pwd`/install-sh"
 AC_SUBST(INSTALL)
 AC_MSG_RESULT(using $INSTALL)
-AC_PATH_PROG(LD,ld)
-AC_PATH_PROG(LN,ln)
+AC_CHECK_TOOL(LD,ld)
+AC_CHECK_TOOL(LN,ln)
 AC_PATH_PROG(MKDIR,mkdir)
 AC_PATH_PROG(MV,mv)
 AC_PATH_PROG(RM,rm)