diff --git a/configure.ac b/configure.ac
index 001ebfc2893b..7d19ebcd213f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -215,7 +215,7 @@ AC_SUBST([testdir])
 ##########################################################################
 AM_CONDITIONAL([netmap_support], [test x$netmap_support = xyes ])
 AM_CONDITIONAL([PKTIO_DPDK], [test x$pktio_dpdk_support = xyes ])
-AM_CONDITIONAL([HAVE_PCAP], [test $have_pcap = yes])
+AM_CONDITIONAL([HAVE_PCAP], [test x$have_pcap = xyes])
 AM_CONDITIONAL([DPDK_DEFAULT_DIR], [test "x${DPDK_DEFAULT_DIR}" = "x1"])
 AM_CONDITIONAL([test_installdir], [test "$testdir" != ""])
 AM_CONDITIONAL([cunit_support], [test x$cunit_support = xyes ])
@@ -320,18 +320,6 @@ ODP_CFLAGS="$ODP_CFLAGS -Wcast-align -Wnested-externs -Wcast-qual -Wformat-nonli
 ODP_CFLAGS="$ODP_CFLAGS -Wformat-security -Wundef -Wwrite-strings"
 ODP_CFLAGS="$ODP_CFLAGS -std=gnu99"
 
-dnl Use -Werror in the checks below since Clang emits a warning instead of
-dnl an error when it encounters an unknown warning option.
-AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough=0],
-                      [ODP_CFLAGS="$ODP_CFLAGS -Wimplicit-fallthrough=0"],
-                      [], [-Werror])
-AX_CHECK_COMPILE_FLAG([-Wformat-truncation=0],
-                      [ODP_CFLAGS="$ODP_CFLAGS -Wformat-truncation=0"],
-                      [], [-Werror])
-AX_CHECK_COMPILE_FLAG([-Wformat-overflow=0],
-                      [ODP_CFLAGS="$ODP_CFLAGS -Wformat-overflow=0"],
-                      [], [-Werror])
-
 # Extra flags for example to suppress certain warning types
 ODP_CFLAGS="$ODP_CFLAGS $ODP_CFLAGS_EXTRA"