diff --git a/configure b/configure
index 4bfa4167ce..ebab2289ba 100755
--- a/configure
+++ b/configure
@@ -2713,12 +2713,65 @@ else
   fi
 fi
 
-if test "$GCC" = yes; then
-  CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
+# The Intel compiler on Linux supports most gcc options, but not
+# all of them, so only add these options if we are really using
+# gcc
 
-  # Some versions of GCC support some additional useful warning flags.
-  # Check whether they are supported, and add them to CFLAGS if so.
-  echo "$as_me:$LINENO: checking if $CC supports -Wdeclaration-after-statement" >&5
+if test "$GCC" = yes; then
+
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+#ifndef __INTEL_COMPILER
+choke me
+#endif
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ICC=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ICC=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+  if test "$ICC" = no; then
+    CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
+
+    # Some versions of GCC support some additional useful warning flags.
+    # Check whether they are supported, and add them to CFLAGS if so.
+    echo "$as_me:$LINENO: checking if $CC supports -Wdeclaration-after-statement" >&5
 echo $ECHO_N "checking if $CC supports -Wdeclaration-after-statement... $ECHO_C" >&6
 pgac_save_CFLAGS=$CFLAGS
 CFLAGS="$pgac_save_CFLAGS -Wdeclaration-after-statement"
@@ -2771,7 +2824,7 @@ echo "${ECHO_T}no" >&6
 fi
 rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
 
-  echo "$as_me:$LINENO: checking if $CC supports -Wendif-labels" >&5
+    echo "$as_me:$LINENO: checking if $CC supports -Wendif-labels" >&5
 echo $ECHO_N "checking if $CC supports -Wendif-labels... $ECHO_C" >&6
 pgac_save_CFLAGS=$CFLAGS
 CFLAGS="$pgac_save_CFLAGS -Wendif-labels"
@@ -2824,6 +2877,7 @@ echo "${ECHO_T}no" >&6
 fi
 rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
 
+  fi
 
   # Disable strict-aliasing rules; needed for gcc 3.3+
   echo "$as_me:$LINENO: checking if $CC supports -fno-strict-aliasing" >&5
@@ -2897,7 +2951,6 @@ fi
 # Check if the compiler still works with the template settings
 echo "$as_me:$LINENO: checking whether the C compiler still works" >&5
 echo $ECHO_N "checking whether the C compiler still works... $ECHO_C" >&6
-
 cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
diff --git a/configure.in b/configure.in
index 8e627b9ce5..982e2081ce 100644
--- a/configure.in
+++ b/configure.in
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-dnl $PostgreSQL: pgsql/configure.in,v 1.457 2006/04/19 16:32:08 tgl Exp $
+dnl $PostgreSQL: pgsql/configure.in,v 1.458 2006/04/21 23:11:58 momjian Exp $
 dnl
 dnl Developers, please strive to achieve this order:
 dnl
@@ -248,13 +248,22 @@ else
   fi
 fi
 
-if test "$GCC" = yes; then
-  CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
+# The Intel compiler on Linux supports most gcc options, but not
+# all of them, so only add these options if we are really using
+# gcc
 
-  # Some versions of GCC support some additional useful warning flags.
-  # Check whether they are supported, and add them to CFLAGS if so.
-  PGAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
-  PGAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
+if test "$GCC" = yes; then
+AC_TRY_COMPILE([], [@%:@ifndef __INTEL_COMPILER
+choke me
+@%:@endif], [ICC=[yes]], [ICC=[no]])
+  if test "$ICC" = no; then
+    CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -Wpointer-arith -Winline"
+
+    # Some versions of GCC support some additional useful warning flags.
+    # Check whether they are supported, and add them to CFLAGS if so.
+    PGAC_PROG_CC_CFLAGS_OPT([-Wdeclaration-after-statement])
+    PGAC_PROG_CC_CFLAGS_OPT([-Wendif-labels])
+  fi
 
   # Disable strict-aliasing rules; needed for gcc 3.3+
   PGAC_PROG_CC_CFLAGS_OPT([-fno-strict-aliasing])