I'm trying to cabal install lambdabot. This depends on a squillion other libraries, which cabal tries to install, among which is readline, which fails to configure as follows. Configuring readline-1.0.1.0... checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... 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 for GNUreadline.framework... checking for readline... no checking for tputs in -lncurses... no checking for tputs in -ltermcap... no checking for tputs in -lcurses... no checking for rl_readline_version... no configure: error: readline not found, so this package cannot be built See `config.log' for more details. cabal: Error: some packages failed to install: readline-1.0.1.0 failed during the configure step. The exception was: ExitFailure 1 From which I conclude that it can't find the readline library. I have all sorts of flavours of readline on my system, so I'll need a bit more information about what exactly it's looking for. It tells me to look in config.log. I presume that this is the config log of the cabal package readline, which cabal automatically downloaded, unpacked ... and presumably automatically cleaned up at the end, because I can't find it anywhere. Where should I be looking for the relevant config.log?