--- psi/fapi_ft.c.orig	2020-10-22 05:57:46 UTC
+++ psi/fapi_ft.c
@@ -102,7 +102,7 @@ typedef struct FT_IncrementalRec_
     FAPI_metrics_type metrics_type;        /* determines whether metrics are replaced, added, etc. */
 } FT_IncrementalRec;
 
-FT_CALLBACK_DEF( void* )
+static void*
 FF_alloc( FT_Memory memory, long size)
 {
     gs_memory_t *mem = (gs_memory_t *)memory->user;
@@ -110,7 +110,7 @@ FF_alloc( FT_Memory memory, long size)
     return(gs_malloc (mem, size, 1, "FF_alloc"));
 }
 
-FT_CALLBACK_DEF( void* )
+static void*
 FF_realloc(FT_Memory memory, long cur_size, long new_size, void* block)
 {
     gs_memory_t *mem = (gs_memory_t *)memory->user;
@@ -130,7 +130,7 @@ FF_realloc(FT_Memory memory, long cur_size, long new_s
     return(tmp);
 }
 
-FT_CALLBACK_DEF( void )
+static void
 FF_free(FT_Memory memory, void* block)
 {
     gs_memory_t *mem = (gs_memory_t *)memory->user;