diff --git a/configure b/configure
index 5dd20e0ace..0863323ed1 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 259849 .
+# From configure.ac Revision: 261914 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for asterisk 1.6.
 #
@@ -36321,7 +36321,6 @@ if test "${USE_VPB}" != "no"; then
    { echo "$as_me:$LINENO: checking for vpb_open in -lvpb" >&5
 echo $ECHO_N "checking for vpb_open in -lvpb... $ECHO_C" >&6; }
    saved_libs="${LIBS}"
-   saved_cflags="${CFLAGS}"
    saved_cppflags="${CPPFLAGS}"
    if test "x${VPB_DIR}" != "x"; then
       if test -d ${VPB_DIR}/lib; then
@@ -36333,7 +36332,7 @@ echo $ECHO_N "checking for vpb_open in -lvpb... $ECHO_C" >&6; }
       CPPFLAGS="${CPPFLAGS} -I${VPB_DIR}/include"
    fi
    LIBS="${PTHREAD_LIBS} ${LIBS} -lvpb"
-   CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+   CPPFLAGS="${CPPFLAGS} ${PTHREAD_CFLAGS}"
    cat >conftest.$ac_ext <<_ACEOF
 
 	/* confdefs.h.  */
@@ -36386,7 +36385,6 @@ fi
 
 rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
       conftest$ac_exeext conftest.$ac_ext
-   CFLAGS="${saved_cflags}"
    LIBS="${saved_libs}"
    CPPFLAGS="${saved_cppflags}"
    if test "${ac_cv_lib_vpb_vpb_open}" = "yes"; then
diff --git a/configure.ac b/configure.ac
index 73b7f6f59d..36aa0d5cd3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1564,7 +1564,6 @@ AC_LANG_PUSH(C++)
 if test "${USE_VPB}" != "no"; then
    AC_MSG_CHECKING(for vpb_open in -lvpb)
    saved_libs="${LIBS}"
-   saved_cflags="${CFLAGS}"
    saved_cppflags="${CPPFLAGS}"
    if test "x${VPB_DIR}" != "x"; then
       if test -d ${VPB_DIR}/lib; then
@@ -1576,7 +1575,7 @@ if test "${USE_VPB}" != "no"; then
       CPPFLAGS="${CPPFLAGS} -I${VPB_DIR}/include"
    fi
    LIBS="${PTHREAD_LIBS} ${LIBS} -lvpb"
-   CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+   CPPFLAGS="${CPPFLAGS} ${PTHREAD_CFLAGS}"
    AC_LINK_IFELSE(
 	[
 	AC_LANG_PROGRAM(
@@ -1590,7 +1589,6 @@ if test "${USE_VPB}" != "no"; then
 		ac_cv_lib_vpb_vpb_open="no" 
 	]
 	)
-   CFLAGS="${saved_cflags}"
    LIBS="${saved_libs}"
    CPPFLAGS="${saved_cppflags}"
    if test "${ac_cv_lib_vpb_vpb_open}" = "yes"; then