diff --git a/espgs/src/configure.ac b/espgs/src/configure.ac

index 29c5a97..06f6506 100644

--- a/espgs/base/configure.ac

+++ b/espgs/base/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/psi/iapi.h

+++ b/espgs/psi/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