Makefile: optional deps

[m6w6/ext-psi] / m4 / psi / psi.m4

diff --git a/m4/psi/psi.m4 b/m4/psi/psi.m4
index 96c648e480918283681a11a95fd4103153023d00..63ed1942ed7cced3ee09dd9d0f5945a7208d8ad3 100644 (file)
--- a/m4/psi/psi.m4
+++ b/m4/psi/psi.m4
@@ -191,7 +191,8 @@ AC_DEFUN(PSI_PTHREAD, [
 dnl PSI_INCLUDES()
 dnl Expands to a complete list of include statements including
 dnl AC_INCLUDES_DEFAULT().
-AC_DEFUN(PSI_INCLUDES, [#define PSI_INCLUDES
+AC_DEFUN(PSI_INCLUDES, [dnl
+#define PSI_INCLUDES
 #ifndef _GNU_SOURCE
 # define _GNU_SOURCE
 #endif
@@ -293,7 +294,10 @@ dnl PSI_LEMON()
 dnl Declare $LEMON precious, and check for a `lemon` in $PATH.
 AC_DEFUN(PSI_LEMON, [
        AC_ARG_VAR(LEMON, The lemon parser generator of the SQLite project)
-       AC_PATH_PROG(LEMON, lemon, ./lemon)
+       if test -z "$LEMON"
+       then
+               AC_PATH_PROG(LEMON, lemon, ./lemon)
+       fi
        PHP_SUBST(LEMON)
 ])