autofs-5.0.7 - use compiler determined by configure instead of hard-coded ones

From: Lan Yixun (dlan) <dennis.yxun@gmail.com>

the logic here is:
 if user pass compiler variable, then use it, otherwise fallback to default value

this will provide most flexibility, so user can set this variable
it would be even useful for cross-compile environment.

Signed-off-by: Lan Yixun (dlan) <dennis.yxun@gmail.com>
---
 CHANGELOG        |    1 +
 Makefile.conf.in |    3 +++
 Makefile.rules   |    8 ++++----
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG b/CHANGELOG
index 679a469..8f349a2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -63,6 +63,7 @@
 - fix hesiod check error and use correct $(LIBS) setting.
 - fix dead LDAP symbolic link when LDAP support is disabled.
 - add missing libtirpc lib to mount_nfs.so when TIRPC enabled.
+- use compiler determined by configure instead of hard-coded ones.
 
 25/07/2012 autofs-5.0.7
 =======================
diff --git a/Makefile.conf.in b/Makefile.conf.in
index 3766d45..cb53e66 100644
--- a/Makefile.conf.in
+++ b/Makefile.conf.in
@@ -109,3 +109,6 @@ initdir = @initdir@
 
 # Location of systemd unit files
 systemddir = @systemddir@
+
+# Use the compiler determined by configure instead of hard-coded ones
+CC := @CC@
diff --git a/Makefile.rules b/Makefile.rules
index 6b5b2bd..9aebd19 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -38,10 +38,10 @@ STRIP     = strip --strip-debug
 endif
 endif
 
-CC        = gcc
-CXX       = g++
-CXXFLAGS  = $(CFLAGS)
-LD        = ld
+CC        ?= gcc
+CXX       ?= g++
+CXXFLAGS  ?= $(CFLAGS)
+LD        ?= ld
 SOLDFLAGS = -shared
 
 CFLAGS += -D_REENTRANT -D_FILE_OFFSET_BITS=64