--- sane-backends-1.0.27.orig/acinclude.m4
+++ sane-backends-1.0.27/acinclude.m4
@@ -439,15 +439,19 @@ AC_DEFUN([SANE_CHECK_GPHOTO2],
   # a program.   And, if that works, then add the -l flags to
   # GPHOTO2_LIBS and any other flags to GPHOTO2_LDFLAGS to pass to
   # sane-config.
-  if test "$with_gphoto2" != "no" ; then
-    AC_CHECK_TOOL(HAVE_GPHOTO2, pkg-config, false)
+  AS_IF([test "$with_gphoto2" != "no"],[
+    AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+    if test "x$PKG_CONFIG" = x; then
+      HAVE_GPHOTO2=false
+    else
+      HAVE_GPHOTO2=$PKG_CONFIG
+    fi
 
     if test ${HAVE_GPHOTO2} != "false" ; then
-      if pkg-config --exists libgphoto2 ; then
-        with_gphoto2="`pkg-config --modversion libgphoto2`"
-	GPHOTO2_CPPFLAGS="`pkg-config --cflags libgphoto2`"
-        GPHOTO2_LIBS="`pkg-config --libs libgphoto2`"
-
+      if $PKG_CONFIG --exists libgphoto2 ; then
+        with_gphoto2="`$PKG_CONFIG --modversion libgphoto2`"
+	GPHOTO2_CPPFLAGS="`$PKG_CONFIG --cflags libgphoto2`"
+        GPHOTO2_LIBS="`$PKG_CONFIG --libs libgphoto2`"
         saved_CPPFLAGS="${CPPFLAGS}"
         CPPFLAGS="${GPHOTO2_CPPFLAGS}"
 	saved_LIBS="${LIBS}"
@@ -431,13 +436,13 @@
         GPHOTO2_LIBS="" 
       else
         SANE_EXTRACT_LDFLAGS(GPHOTO2_LIBS, GPHOTO2_LDFLAGS)
-        if pkg-config --atleast-version=2.5.0 libgphoto2; then
+        if $PKG_CONFIG --atleast-version=2.5.0 libgphoto2; then
           AC_DEFINE([GPLOGFUNC_NO_VARGS], [1],
                     [Define if GPLogFunc does not take a va_list.])
         fi
       fi
     fi
-  fi
+  ])
   AC_SUBST(GPHOTO2_CPPFLAGS)
   AC_SUBST(GPHOTO2_LIBS)
   AC_SUBST(GPHOTO2_LDFLAGS)