+AC_PATH_PROG([FONTFORGE], [fontforge])
+AS_IF(
+ [test -z "${FONTFORGE}"],
+ [AC_MSG_ERROR([fontforge program not found])]
+)
+
+AC_PATH_PROG([SCOUR], [scour])
+AS_IF(
+ [test -z "${SCOUR}"],
+ [AC_MSG_ERROR([scour program not found])]
+)
+
+AC_PATH_PROG([XSLTPROC], [xsltproc])
+AS_IF(
+ [test -z "${XSLTPROC}"],
+ [AC_MSG_ERROR([xsltproc program not found])]