Hello, When I tried to build 1.12 (from the sources, on Solaris, with GHC, worked perfectly with 1.10), I got gcc -c -I../Kernel -I/q/pd/nhc/nhc98-1.12/include -D__EXTENSIONS__ -O3 -DHIGH_BYTE_FIRST -o /q/pd/nhc/nhc98-1.12/targets/sparc-solaris2/obj/runtime/Builtin/cFFI.o cFFI.c In file included from cFFI.c:3: HsFFI.h:5: stdint.h: No such file or directory Regards, -- Feliks