diff --git a/configure b/configure
index d1472243b6..62fb6033a3 100755
--- a/configure
+++ b/configure
@@ -11316,7 +11316,7 @@ echo "${ECHO_T}$ac_cv_c_compiler_gnu" >&6
 GCC=`test $ac_compiler_gnu = yes && echo yes`
 ac_test_CFLAGS=${CFLAGS+set}
 ac_save_CFLAGS=$CFLAGS
-CFLAGS="$CFLAGS -g"
+CFLAGS="-g"
 echo "$as_me:$LINENO: checking whether $CC accepts -g" >&5
 echo $ECHO_N "checking whether $CC accepts -g... $ECHO_C" >&6
 if test "${ac_cv_prog_cc_g+set}" = set; then
@@ -11706,7 +11706,7 @@ fi
         unset ac_cv_prog_cc_g
         ac_test_CFLAGS=${CFLAGS+set}
 ac_save_CFLAGS=$CFLAGS
-CFLAGS="$CFLAGS -g"
+CFLAGS="-g"
 echo "$as_me:$LINENO: checking whether $CC accepts -g" >&5
 echo $ECHO_N "checking whether $CC accepts -g... $ECHO_C" >&6
 if test "${ac_cv_prog_cc_g+set}" = set; then
@@ -12544,9 +12544,9 @@ if test "$ac_test_CXXFLAGS" = set; then
   CXXFLAGS=$ac_save_CXXFLAGS
 elif test $ac_cv_prog_cxx_g = yes; then
   if test "$GXX" = yes; then
-    CXXFLAGS="$CXXFLAGS -g -O2"
+    CXXFLAGS="-g -O2"
   else
-    CXXFLAGS="$CXXFLAGS -g"
+    CXXFLAGS="-g"
   fi
 else
   if test "$GXX" = yes; then
@@ -12784,9 +12784,9 @@ if test "$ac_test_CXXFLAGS" = set; then
   CXXFLAGS=$ac_save_CXXFLAGS
 elif test $ac_cv_prog_cxx_g = yes; then
   if test "$GXX" = yes; then
-    CXXFLAGS="$CXXFLAGS -g -O2"
+    CXXFLAGS="-g -O2"
   else
-    CXXFLAGS="$CXXFLAGS -g"
+    CXXFLAGS="-g"
   fi
 else
   if test "$GXX" = yes; then
@@ -21470,6 +21470,10 @@ if test "x$SUNCXX" = xyes; then
     CXXFLAGS="$CXXFLAGS -features=tmplife"
 fi
 
+if test "x$SUNCC" = xyes; then
+    CFLAGS="$CFLAGS -erroff=E_NO_EXPLICIT_TYPE_GIVEN"
+fi
+
 if test "$wxUSE_STD_STRING" = "yes" -o "$wxUSE_STL" = "yes"; then
     ac_ext=cc
 ac_cpp='$CXXCPP $CPPFLAGS'
diff --git a/configure.in b/configure.in
index 2e8befe0d1..db77e73221 100644
--- a/configure.in
+++ b/configure.in
@@ -1918,6 +1918,14 @@ if test "x$SUNCXX" = xyes; then
     CXXFLAGS="$CXXFLAGS -features=tmplife"
 fi
 
+dnl Sun X11 headers are (still, in 2005!) non-ANSI and the best they could do
+dnl was to hack their C++ compiler to accept them silently -- but C compiler
+dnl still spits out dozens of warnings for each X include file, so suppress
+dnl them
+if test "x$SUNCC" = xyes; then
+    CFLAGS="$CFLAGS -erroff=E_NO_EXPLICIT_TYPE_GIVEN"
+fi
+
 dnl check for std::string or std::wstring
 if test "$wxUSE_STD_STRING" = "yes" -o "$wxUSE_STL" = "yes"; then
     AC_LANG_PUSH(C++)