I had all of the wxHaskell programs installed and working fine, but now with an update to Haskell Platform and thus also ghci, I need to upgrade all of them (the previously working programs fail) requiring an update for the underlying wxWidgets from 2.8 to 2.9 versions. I downloaded and built wxWidgets 2.9, since the current wxHaskell libraries require it (I couldn't find any existing binaries online). The compile seemed to be successful, but when I then try to use it from the wxHaskell programs I get an error that I don't know how to fix: C: >cabal install wx Resolving dependencies... [1 of 1] Compiling Main ( C:\Users\guthrie\AppData\Local\Temp\wxc-0. 90.0.3-7324\wxc-0.90.0.3\Setup.hs, C:\Users\guthrie\AppData\Local\Temp\wxc-0.90. 0.3-7324\wxc-0.90.0.3\dist\setup\Main.o ) Linking C:\Users\guthrie\AppData\Local\Temp\wxc-0.90.0.3-7324\wxc-0.90.0.3\dist\ setup\setup.exe ... Configuring wxc-0.90.0.3... Configuring wxc to build against wxWidgets 2.9 setup.exe: Missing dependencies on foreign libraries: * Missing C libraries: wxmsw29ud_all, wxtiffd, wxjpegd, wxpngd, wxzlibd,wxregexud, wxexpatd, wxregexud This problem can usually be solved by installing the system packages that provide these libraries (you may need the "-dev" versions). If the libraries are already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are. cabal: Error: some packages failed to install: wx-0.90.0.1 depends on wxc-0.90.0.3 which failed to install. wxc-0.90.0.3 failed during the configure step. The exception was: ExitFailure 1 wxcore-0.90.0.1 depends on wxc-0.90.0.3 which failed to install.