All, I noticed that the latest version of glib includes a liberal sprinkling of G_GNUC_MALLOC macros which expands to __attribute__((__malloc__)) Some functions already had an __attribute__, so now they've got a list of them. It seems that c2hs does not expect more than one __attribute__. So here's a patch In CParsers.hs we just change each instance of optMaybe parseGnuCAttr to list parseGnuCAttr This patch is against the gtk2hs cvs version but it should apply ok to the main c2hs branch. Duncan Index: tools/c2hs/c/CParser.hs =================================================================== RCS file: /cvsroot/gtk2hs/gtk2hs/tools/c2hs/c/CParser.hs,v retrieving revision 1.1 diff -C2 -r1.1 CParser.hs *** tools/c2hs/c/CParser.hs 21 Nov 2004 21:05:27 -0000 1.1 --- tools/c2hs/c/CParser.hs 12 Jan 2005 17:03:50 -0000 *************** *** 347,351 **** ctoken_ (CTokGnuC GnuCExtTok) `opt` () -- ignore GCC's __extension__ -*> parseCDeclSpec ! *-> optMaybe parseGnuCAttr -- ignore GCC's __attribute__ )*> parseCDeclr *> list parseCDecl --- 347,351 ---- ctoken_ (CTokGnuC GnuCExtTok) `opt` () -- ignore GCC's __extension__ -*> parseCDeclSpec ! *-> list parseGnuCAttr -- ignore GCC's __attribute__ )*> parseCDeclr *> list parseCDecl *************** *** 490,494 **** ctoken_ (CTokGnuC GnuCExtTok) `opt` () -- ignore GCC's __extension__ -*> parseCDeclSpec ! *-> optMaybe parseGnuCAttr -- ignore GCC's __attribute__ )*> seplist comma_ parseCInitDecl *-> semic_ `actionAttrs` --- 490,494 ---- ctoken_ (CTokGnuC GnuCExtTok) `opt` () -- ignore GCC's __extension__ -*> parseCDeclSpec ! *-> list parseGnuCAttr -- ignore GCC's __attribute__ )*> seplist comma_ parseCInitDecl *-> semic_ `actionAttrs` *************** *** 682,686 **** *> base *> many (flip (.)) id (arrayType <|> newStyleFun <|> oldStyleFun) ! *-> optMaybe parseGnuCAttr -- ignore GCC's __attribute__ `action` \((ptr, base), declrTrans) -> ptr . declrTrans $ base --- 682,686 ---- *> base *> many (flip (.)) id (arrayType <|> newStyleFun <|> oldStyleFun) ! *-> list parseGnuCAttr -- ignore GCC's __attribute__ `action` \((ptr, base), declrTrans) -> ptr . declrTrans $ base