Please set "javascript.options.jit.content" to false in greprefs\all.js case you get crashes at startup! This build of SeaMonkey for OS/2 was made from code in comm-central and mozilla-central dated 2008-11-18 12:29 PST (changesets 1144:832c859036ef and 21766:5b9f7cddadcb, resp.). But the build could only be completed (with GCC 3.3.5) by adding the patches for bug 451278 and bug 453705. The corresponding Bugzilla attachments are: https://bugzilla.mozilla.org/attachment.cgi?id=334654 https://bugzilla.mozilla.org/attachment.cgi?id=337204 And the patch for cairo as pasted below. diff --git a/gfx/cairo/cairo/src/cairo-os2-private.h b/gfx/cairo/cairo/src/cairo-os2-private.h --- a/gfx/cairo/cairo/src/cairo-os2-private.h +++ b/gfx/cairo/cairo/src/cairo-os2-private.h @@ -38,7 +38,6 @@ #ifndef CAIRO_OS2_PRIVATE_H #define CAIRO_OS2_PRIVATE_H -#include "cairo-os2.h" #include "cairoint.h" #define INCL_DOS @@ -51,6 +50,7 @@ #else # include #endif +#include "cairo-os2.h" typedef struct _cairo_os2_surface {