build fails on FreeBSD 10.0

[frasertweedale]

Installation fails on FreeBSD 10.0; the configure script fails to locate the curl library.

Transcript:

[ master ] fraser% cabal install
Resolving dependencies...
Configuring curl-1.3.8...
checking for gcc... no                                                      
checking for cc... cc
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 cc accepts -g... yes
checking for cc option to accept ANSI C... none needed
checking how to run the C preprocessor... cc -E
configure: error: curl libraries not found, so curl package cannot be built
See `config.log' for more details.
Failed to install curl-1.3.8
cabal: Error: some packages failed to install:
curl-1.3.8 failed during the configure step. The exception was:
ExitFailure 1

A portion of the resultant config.log:

[ master ] fraser% cabal install
Resolving dependencies...
Configuring curl-1.3.8...
checking for gcc... no                                                      
checking for cc... cc
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 cc accepts -g... yes
checking for cc option to accept ANSI C... none needed
checking how to run the C preprocessor... cc -E
configure: error: curl libraries not found, so curl package cannot be built
See `config.log' for more details.
Failed to install curl-1.3.8
cabal: Error: some packages failed to install:
curl-1.3.8 failed during the configure step. The exception was:
ExitFailure 1

[cgag]

Running into this as well, let me know if you ever figured out how to solve this.

edit: You can install the hs-curl package from ports. Wish I knew how to get it to build depending only on things in the local sandbox though.

[frasertweedale]

Adding CPATH=/usr/local/include to environment fixes the issue. Ideally, Cabal would
know to do this on FreeBSD.

With GHC 7.8 you also need to cc-options: -fPIC. Ideally, Cabal would know to do
this as well (and there is a ticket: haskell/cabal#2207)

I'm encountering this on Ubuntu 14 too... Neither of @frasertweedale solutions worked for me, but I also don't really know what I"m doing...