--- fftw/api/fftw3.h

+++ fftw/api/fftw3.h

@@ -83,7 +83,7 @@ extern "C"

 #    define FFTW_EXTERN extern __declspec(dllimport)

 #  endif

 #else

-#  define FFTW_EXTERN extern

+#  define FFTW_EXTERN extern __attribute__ ((visibility("default")))

 #endif

 /* specify calling convention (Windows only) */

--- fftw/api/x77.h

+++ fftw/api/x77.h

@@ -65,5 +65,5 @@

 #if defined(FFTW_DLL) && (defined(_WIN32) || defined(__WIN32__))

 #  define FFTW_VOIDFUNC __declspec(dllexport) void

 #else

-#  define FFTW_VOIDFUNC void

+#  define FFTW_VOIDFUNC void __attribute__ ((visibility("default")))

 #endif

--- fftw/dft/dft.h

+++ fftw/dft/dft.h

@@ -54,7 +54,7 @@ typedef struct {

      dftapply apply;

 } plan_dft;

-plan *X(mkplan_dft)(size_t size, const plan_adt *adt, dftapply apply);

+IFFTW_EXTERN plan *X(mkplan_dft)(size_t size, const plan_adt *adt, dftapply apply);

 #define MKPLAN_DFT(type, adt, apply) \

   (type *)X(mkplan_dft)(sizeof(type), adt, apply)

--- fftw/kernel/ifftw.h

+++ fftw/kernel/ifftw.h

@@ -56,7 +56,7 @@ extern "C"

  && (defined(_WIN32) || defined(__WIN32__))

 #  define IFFTW_EXTERN extern __declspec(dllexport)

 #else

-#  define IFFTW_EXTERN extern

+#  define IFFTW_EXTERN extern __attribute__ ((visibility("default")))

 #endif

 /* determine precision and name-mangling scheme */

@@ -581,10 +581,10 @@ struct solver_s {

      int refcnt;

 };

-solver *X(mksolver)(size_t size, const solver_adt *adt);

+IFFTW_EXTERN solver *X(mksolver)(size_t size, const solver_adt *adt);

 void X(solver_use)(solver *ego);

 void X(solver_destroy)(solver *ego);

-void X(solver_register)(planner *plnr, solver *s);

+IFFTW_EXTERN void X(solver_register)(planner *plnr, solver *s);

 /* shorthand */

 #define MKSOLVER(type, adt) (type *)X(mksolver)(sizeof(type), adt)

--- fftw/rdft/rdft.h

+++ fftw/rdft/rdft.h

@@ -67,7 +67,7 @@ typedef struct {

      rdftapply apply;

 } plan_rdft;

-plan *X(mkplan_rdft)(size_t size, const plan_adt *adt, rdftapply apply);

+IFFTW_EXTERN plan *X(mkplan_rdft)(size_t size, const plan_adt *adt, rdftapply apply);

 #define MKPLAN_RDFT(type, adt, apply) \

   (type *)X(mkplan_rdft)(sizeof(type), adt, apply)

@@ -148,7 +148,7 @@ typedef struct {

      rdft2apply apply;

 } plan_rdft2;

-plan *X(mkplan_rdft2)(size_t size, const plan_adt *adt, rdft2apply apply);

+IFFTW_EXTERN plan *X(mkplan_rdft2)(size_t size, const plan_adt *adt, rdft2apply apply);

 #define MKPLAN_RDFT2(type, adt, apply) \

   (type *)X(mkplan_rdft2)(sizeof(type), adt, apply)