From 7c5d6fce3a6f52243948e3eae452acb968d78469 Mon Sep 17 00:00:00 2001
From: Simon Ruderich <simon@ruderich.org>
Date: Mon, 3 Jun 2013 21:59:57 +0200
Subject: [PATCH] Only hook vfork() if it's available.

---
 configure.ac        | 2 ++
 src/coloredstderr.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index 6064f08..79a99f5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,9 +37,11 @@ AC_C_INLINE
 
 AC_CHECK_HEADERS([fcntl.h])
 
+AC_TYPE_PID_T
 AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
 
+AC_FUNC_FORK
 AC_FUNC_MALLOC
 AC_FUNC_REALLOC
 AC_CHECK_FUNCS([dup2 memmove setenv strdup])
diff --git a/src/coloredstderr.c b/src/coloredstderr.c
index 9ade423..c152218 100644
--- a/src/coloredstderr.c
+++ b/src/coloredstderr.c
@@ -330,6 +330,7 @@ int fclose(FILE *fp) {
 
 /* Hook functions which are necessary for correct tracking. */
 
+#if defined(HAVE_VFORK) && defined(HAVE_FORK)
 pid_t vfork(void) {
     /* vfork() is similar to fork() but the address space is shared between
      * father and child. It's designed for fork()/exec() usage because it's
@@ -344,3 +345,4 @@ pid_t vfork(void) {
      * most systems use copy-on-write anyway not a performance issue. */
     return fork();
 }
+#endif
-- 
2.45.2