configure: Building in-tree ghc-pwd
/usr/local/lib/ghc/libHSrts.a(RtsFlags.o)(.text+0x2cd): In function `copyArg':
: warning: strcpy() is almost always misused, please use strlcpy()
/usr/local/lib/ghc/libHSrts.a(RtsUtils.o)(.text+0x329): In function `showStgWord64':
: warning: sprintf() is often misused, please use snprintf()
checking for path to top of build tree... /home/roland/tmp/test/builder/tempbuild/build
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking how to run the C preprocessor... gcc -E
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for ffi_call in -lffi... no
configure: error: Cannot find system libffi