https://bugs.gentoo.org/723946k
--- a/toonz/sources/common/twain/twain.h
+++ b/toonz/sources/common/twain/twain.h
@@ -2209,7 +2209,7 @@ typedef struct {
 #elif defined(TWH_CMP_GNU)
 #pragma pack(pop, before_twain)
 #elif defined(TWH_CMP_BORLAND)
-#pragma option a.
+#pragma option_a.
 #elif defined(TWH_CMP_XCODE)
 #if PRAGMA_STRUCT_ALIGN
 #pragma options align = reset
 
