[PATCH 2/4] Add missing guards around config.h inclusion

[Emil Velikov]

From: Chih-Wei Huang <cwhuang at linux.org.tw>

In some cases the header may not exist, leading to compilation issues.
Add the ifdef HAVE_CONFIG_H, as it is those in other parts of the
project.

[Emil Velikov: Split out from a larger commit, rework commit message]
Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>
---
 src/common_vgaarb.c | 3 +++
 src/freebsd_pci.c   | 3 +++
 src/linux_sysfs.c   | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/src/common_vgaarb.c b/src/common_vgaarb.c
index ab3c5e8..b2e1d8a 100644
--- a/src/common_vgaarb.c
+++ b/src/common_vgaarb.c
@@ -33,7 +33,10 @@
 #include <stdlib.h>
 #include <limits.h>
 
+#ifdef HAVE_CONFIG_H
 #include "config.h"
+#endif
+
 #include "pciaccess.h"
 #include "pciaccess_private.h"
 
diff --git a/src/freebsd_pci.c b/src/freebsd_pci.c
index 7f5f56b..a9304de 100644
--- a/src/freebsd_pci.c
+++ b/src/freebsd_pci.c
@@ -45,7 +45,10 @@
 #include <sys/mman.h>
 #include <sys/memrange.h>
 
+#ifdef HAVE_CONFIG_H
 #include "config.h"
+#endif
+
 #include "pciaccess.h"
 #include "pciaccess_private.h"
 
diff --git a/src/linux_sysfs.c b/src/linux_sysfs.c
index 8fca65e..08c9971 100644
--- a/src/linux_sysfs.c
+++ b/src/linux_sysfs.c
@@ -57,7 +57,9 @@
 #define iopl(x) -1
 #endif
 
+#ifdef HAVE_CONFIG_H
 #include "config.h"
+#endif
 
 #ifdef HAVE_MTRR
 #include <asm/mtrr.h>
-- 
2.2.2