diff --git a/espgs/src/configure.ac b/espgs/src/configure.ac
index 29c5a97..06f6506 100644
--- a/espgs/src/configure.ac
+++ b/espgs/src/configure.ac
@@ -791,7 +791,7 @@ AC_ARG_ENABLE(dynamic, [  --enable-dynamic        enable dynamically loaded driv
 [	case `uname` in
 		Linux*)
 		INSTALL_SHARED="install-shared"
-		DYNAMIC_CFLAGS="-fPIC"
+		DYNAMIC_CFLAGS="-fPIC -fvisibility=hidden -D_Linux"
 		if test "x$X_DEVS" != x; then
 			DYNAMIC_DEVS="\$(GLOBJDIR)/X11.so"
 		else
diff --git a/espgs/src/iapi.h b/espgs/src/iapi.h
index ca49da3..e2ee08e 100644
--- a/espgs/src/iapi.h
+++ b/espgs/src/iapi.h
@@ -82,6 +82,12 @@ extern "C" {
 # pragma export on
 #endif
 
+#ifdef _Linux
+# ifndef GSDLLEXPORT
+#  define GSDLLEXPORT __attribute__((__visibility__("default")))
+# endif
+#endif /* _Linux */
+
 #ifndef GSDLLEXPORT
 # define GSDLLEXPORT
 #endif