diff --git a/configure b/configure
index ae181e330cf..708fb92a969 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 259848 .
+# From configure.ac Revision: 261913 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for asterisk 1.6.
 #
@@ -44659,7 +44659,6 @@ 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
@@ -44671,7 +44670,7 @@ 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.  */
@@ -44724,7 +44723,6 @@ 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 "${ac_cv_lib_vpb_vpb_open}" = "yes"; then
diff --git a/configure.ac b/configure.ac
index b7647cabdb5..d8da16e1487 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1730,7 +1730,6 @@ AC_LANG_PUSH(C++)
 if test "${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 ${VPB_DIR}/lib; then
@@ -1742,7 +1741,7 @@ if test "${USE_VPB}" != "no"; then
       CPPFLAGS="${CPPFLAGS} -I${VPB_DIR}/include"
    fi
    LIBS="${PTHREAD_LIBS} ${LIBS} -lvpb"
-   CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+   CPPFLAGS="${CPPFLAGS} ${PTHREAD_CFLAGS}"
    AC_LINK_IFELSE(
 	[
 	AC_LANG_PROGRAM(
@@ -1756,7 +1755,6 @@ if test "${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