AC_PROG_SED
# Python
-AM_PATH_PYTHON([3.5])
+AM_PATH_PYTHON([3.4])
-# scss
+# sass
AC_CHECK_PROG(SASSC, [sassc], [sassc])
+if test -z "${SASSC}"; then
+ AC_MSG_ERROR([sassc is required])
+fi
+
+# convert from ImageMagick
+AC_CHECK_PROG(CONVERT, [convert], [convert])
+if test -z "${CONVERT}"; then
+ AC_MSG_ERROR([convert is required])
+fi
+
+# ffmpeg
+AC_CHECK_PROG(FFMPEG, [ffmpeg], [ffmpeg])
+if test -z "${FFMPEG}"; then
+ AC_MSG_ERROR([ffmpeg is required])
+fi
# ------------------------------------------------------------------------------