diff --git a/include/boost/exception/current_exception_cast.hpp b/include/boost/exception/current_exception_cast.hpp
index 950eeff..ddcfd27 100644
--- a/include/boost/exception/current_exception_cast.hpp
+++ b/include/boost/exception/current_exception_cast.hpp
@@ -7,7 +7,7 @@
 #define BOOST_EXCEPTION_7E83C166200811DE885E826156D89593
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/detail/clone_current_exception.hpp b/include/boost/exception/detail/clone_current_exception.hpp
index 5c953c1..d560f1c 100644
--- a/include/boost/exception/detail/clone_current_exception.hpp
+++ b/include/boost/exception/detail/clone_current_exception.hpp
@@ -7,7 +7,7 @@
 #define BOOST_EXCEPTION_81522C0EB56511DFAB613DB0DFD72085
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/detail/error_info_impl.hpp b/include/boost/exception/detail/error_info_impl.hpp
index 30ccffd..d97c6f3 100644
--- a/include/boost/exception/detail/error_info_impl.hpp
+++ b/include/boost/exception/detail/error_info_impl.hpp
@@ -14,7 +14,7 @@
 #include <string>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/detail/exception_ptr.hpp b/include/boost/exception/detail/exception_ptr.hpp
index cdfc3be..37fdb9e 100644
--- a/include/boost/exception/detail/exception_ptr.hpp
+++ b/include/boost/exception/detail/exception_ptr.hpp
@@ -26,7 +26,7 @@
 #include <stdlib.h>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/detail/is_output_streamable.hpp b/include/boost/exception/detail/is_output_streamable.hpp
index a61f986..980cddc 100644
--- a/include/boost/exception/detail/is_output_streamable.hpp
+++ b/include/boost/exception/detail/is_output_streamable.hpp
@@ -9,7 +9,7 @@
 #include <ostream>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/detail/object_hex_dump.hpp b/include/boost/exception/detail/object_hex_dump.hpp
index c195de5..42d517b 100644
--- a/include/boost/exception/detail/object_hex_dump.hpp
+++ b/include/boost/exception/detail/object_hex_dump.hpp
@@ -14,7 +14,7 @@
 #include <cstdlib>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/detail/type_info.hpp b/include/boost/exception/detail/type_info.hpp
index 0d46fd6..72716b5 100644
--- a/include/boost/exception/detail/type_info.hpp
+++ b/include/boost/exception/detail/type_info.hpp
@@ -14,7 +14,7 @@
 #include <string.h>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/diagnostic_information.hpp b/include/boost/exception/diagnostic_information.hpp
index 145fbe5..b26c502 100644
--- a/include/boost/exception/diagnostic_information.hpp
+++ b/include/boost/exception/diagnostic_information.hpp
@@ -21,7 +21,7 @@
 #endif
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/errinfo_errno.hpp b/include/boost/exception/errinfo_errno.hpp
index 31cd782..08d1a73 100644
--- a/include/boost/exception/errinfo_errno.hpp
+++ b/include/boost/exception/errinfo_errno.hpp
@@ -11,7 +11,7 @@
 #include <string.h>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/get_error_info.hpp b/include/boost/exception/get_error_info.hpp
index 09a224a..efe093e 100644
--- a/include/boost/exception/get_error_info.hpp
+++ b/include/boost/exception/get_error_info.hpp
@@ -14,7 +14,7 @@
 #include <boost/assert.hpp>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/info.hpp b/include/boost/exception/info.hpp
index 3fd6681..f6a350f 100644
--- a/include/boost/exception/info.hpp
+++ b/include/boost/exception/info.hpp
@@ -14,7 +14,7 @@
 #include <map>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/info_tuple.hpp b/include/boost/exception/info_tuple.hpp
index 74d7e87..8dc6a4c 100644
--- a/include/boost/exception/info_tuple.hpp
+++ b/include/boost/exception/info_tuple.hpp
@@ -10,7 +10,7 @@
 #include <boost/tuple/tuple.hpp>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/to_string.hpp b/include/boost/exception/to_string.hpp
index 49f1b18..513c874 100644
--- a/include/boost/exception/to_string.hpp
+++ b/include/boost/exception/to_string.hpp
@@ -11,7 +11,7 @@
 #include <sstream>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__
diff --git a/include/boost/exception/to_string_stub.hpp b/include/boost/exception/to_string_stub.hpp
index 5fbfba7..151b38e 100644
--- a/include/boost/exception/to_string_stub.hpp
+++ b/include/boost/exception/to_string_stub.hpp
@@ -11,7 +11,7 @@
 #include <boost/assert.hpp>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
-#if __GNUC__*100+__GNUC_MINOR__>301
+#if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
 #endif
 #ifdef __clang__