diff --git a/configure.ac b/configure.ac
index 56d17c3a..46f22a4d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -56,8 +56,8 @@ dnl
 dnl Calls pkg-config --static
 dnl
 AC_DEFUN([PKG_STATIC], [
-  if AC_RUN_LOG([pkg-config --exists --print-errors "$2"]); then
-    $1=`pkg-config --libs --static "$2"`
+  if AC_RUN_LOG([${PKG_CONFIG} --exists --print-errors "$2"]); then
+    $1=`${PKG_CONFIG} --libs --static "$2"`
     AC_SUBST([$1])
   else
     AC_MSG_ERROR([pkg-config description of $2, needed for static build, is not available])
@@ -214,8 +214,8 @@ AC_SUBST(BTRFSRESTORE_ZSTD)
 # Our udev rule gives us the friendly dm names but isn't required (or valid)
 # on earlier releases.
 UDEVDIR=
-if pkg-config udev --atleast-version 190; then
-	UDEVDIR="$(pkg-config udev --variable=udevdir)"
+if ${PKG_CONFIG} udev --atleast-version 190; then
+	UDEVDIR="$(${PKG_CONFIG} udev --variable=udevdir)"
 fi
 AC_SUBST(UDEVDIR)