id summary reporter owner description type status priority milestone component version severity resolution keywords cc difficulty ghcversion platform 538 --constraint= is not respected for base Saizan kosmikus "the --constraint= flag apparently does nothing when the constraint involves base. e.g. to install directory-1.0.0.3, that imports Control.Exception.Base and only lists ""base"" in build-depends, you need to add ""base >= 4"", but cabal install directory --constraint=""base >= 4"" picks base-3.0.3.0 anyway. {{{ saizan@astarte:~/trash/directory-1.0.0.3$ cabal configure --constraint=""base >= 4"" Resolving dependencies... Configuring directory-1.0.0.3... 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 how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /bin/grep checking for egrep... /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 sys/types.h... (cached) yes checking for unistd.h... (cached) yes checking for sys/stat.h... (cached) yes configure: creating ./config.status config.status: creating include/HsDirectoryConfig.h config.status: include/HsDirectoryConfig.h is unchanged saizan@astarte:~/trash/directory-1.0.0.3$ cabal build -v Creating dist/build (and its parents) Creating dist/build/autogen (and its parents) Preprocessing library directory-1.0.0.3... Building directory-1.0.0.3... Building library... Creating dist/build (and its parents) /usr/local/bin/ghc -package-name directory-1.0.0.3 --make -hide-all-packages -i -idist/build -i. -idist/build/autogen -Idist/build/autogen -Idist/build -Iinclude -optP-include -optPdist/build/autogen/cabal_macros.h -#include ""HsDirectory.h"" -odir dist/build -hidir dist/build -stubdir dist/build -package base-3.0.3.0 -package filepath-1.1.0.1 -package old-time-1.0.0.1 -package unix-2.3.1.0 -O -XCPP -XForeignFunctionInterface System.Directory System/Directory.hs:81:7: Could not find module `Control.Exception.Base': it is a member of package base, which is hidden }}}" defect new low cabal-install-0.16 cabal-install tool 1.6.0.2 normal solver unknown