default make and install to environment variables

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/configure b/configure
index fa68359..89cfa12 100755
--- a/configure
+++ b/configure
@@ -79,8 +79,6 @@
 audio_possible_cards="ac97 es1370 sb16 cs4231a adlib gus hda"
 block_drv_whitelist=""
 host_cc="gcc"
-make="make"
-install="install"
 helper_cflags=""
 libs_softmmu=""
 libs_tools=""
@@ -363,7 +361,7 @@
 ;;
 FreeBSD)
   bsd="yes"
-  make="gmake"
+  make="${MAKE-gmake}"
   audio_drv_list="oss"
   audio_possible_drivers="oss sdl esd pa"
   # needed for kinfo_getvmmap(3) in libutil.h
@@ -371,20 +369,20 @@
 ;;
 DragonFly)
   bsd="yes"
-  make="gmake"
+  make="${MAKE-gmake}"
   audio_drv_list="oss"
   audio_possible_drivers="oss sdl esd pa"
 ;;
 NetBSD)
   bsd="yes"
-  make="gmake"
+  make="${MAKE-gmake}"
   audio_drv_list="oss"
   audio_possible_drivers="oss sdl esd"
   oss_lib="-lossaudio"
 ;;
 OpenBSD)
   bsd="yes"
-  make="gmake"
+  make="${MAKE-gmake}"
   audio_drv_list="oss"
   audio_possible_drivers="oss sdl esd"
   oss_lib="-lossaudio"
@@ -413,8 +411,8 @@
 ;;
 SunOS)
   solaris="yes"
-  make="gmake"
-  install="ginstall"
+  make="${MAKE-gmake}"
+  install="${INSTALL-ginstall}"
   ld="gld"
   needs_libsunmath="no"
   solarisrev=`uname -r | cut -f2 -d.`
@@ -453,7 +451,7 @@
 ;;
 AIX)
   aix="yes"
-  make="gmake"
+  make="${MAKE-gmake}"
 ;;
 Haiku)
   haiku="yes"
@@ -479,6 +477,9 @@
   bsd_user="yes"
 fi
 
+: ${make=${MAKE-make}}
+: ${install=${INSTALL-install}}
+
 if test "$mingw32" = "yes" ; then
   EXESUF=".exe"
   QEMU_CFLAGS="-DWIN32_LEAN_AND_MEAN -DWINVER=0x501 $QEMU_CFLAGS"