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-rw-r--r--acx_python.m42
1 files changed, 1 insertions, 1 deletions
diff --git a/acx_python.m4 b/acx_python.m4
index c945d6c8989e..4ed298cf9ebd 100644
--- a/acx_python.m4
+++ b/acx_python.m4
@@ -9,7 +9,7 @@ AC_DEFUN([AC_PYTHON_DEVEL],[
AC_PATH_PROG([PYTHON],[python[$PYTHON_VERSION]])
if test -z "$PYTHON"; then
- AC_MSG_ERROR([Cannot find python$PYTHON_VERSION in your system path])
+ AC_MSG_ERROR([Cannot find 'python$PYTHON_VERSION' in your system path. You can use the environment variable 'PYTHON_VERSION=version_number' for an explicit version.])
PYTHON_VERSION=""
fi