14:28 root@pc-francois /home/francois# emerge -pDvu  --verbose-conflicts world

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  rR    ] dev-haskell/text-0.11.3.1:0/0.11.3.1::gentoo  USE="-developer -doc -hscolour -profile {-test}" 0 KiB
[ebuild  r  U  ] dev-haskell/text-1.1.1.3:0/1.1.1.3::gentoo [0.11.3.1:0/0.11.3.1::gentoo] USE="-developer -doc -hscolour -profile {-test}" 135 KiB
[ebuild  N     ] dev-haskell/stm-2.4.2:0/2.4.2::gentoo  USE="-doc -hscolour -profile" 10 KiB
[ebuild  rR    ] dev-haskell/hashable-1.2.1.0:0/1.2.1.0::gentoo  USE="-doc -hscolour -profile {-test}" CPU_FLAGS_X86="sse2 sse4_1" 0 KiB
[ebuild  rR    ] dev-haskell/blaze-builder-0.3.3.2:0/0.3.3.2::gentoo  USE="-doc -hscolour -profile" 0 KiB
[ebuild  rR    ] dev-haskell/attoparsec-0.10.4.0:0/0.10.4.0::gentoo  USE="-doc -hscolour -profile {-test}" 0 KiB
[ebuild  rR    ] dev-haskell/xml-1.3.13:0/1.3.13::gentoo  USE="-doc -hscolour -profile" 0 KiB
[ebuild  N     ] dev-haskell/exceptions-0.6.1:0/0.6.1::gentoo  USE="-doc -hscolour -profile {-test}" 12 KiB
[ebuild  rR    ] dev-haskell/tagsoup-0.13:0/0.13::gentoo  USE="-doc -download -hscolour -profile" 0 KiB
[ebuild  rR    ] dev-haskell/mime-types-0.1.0.3:0/0.1.0.3::gentoo  USE="-doc -hscolour -profile" 0 KiB
[ebuild  N     ] dev-haskell/async-2.0.1.4:0/2.0.1.4::gentoo  USE="-doc -hscolour -profile {-test}" 9 KiB
[ebuild  rR    ] dev-haskell/case-insensitive-1.0.0.2-r1:0/1.0.0.2::gentoo  USE="-doc -hscolour -profile {-test}" 0 KiB
[ebuild  rR    ] dev-haskell/publicsuffixlist-0.1:0/0.1::gentoo  USE="-create -doc -hscolour -profile -runtimelist {-test}" 0 KiB
[ebuild  N     ] dev-haskell/scientific-0.2.0.1:0/0.2.0.1::gentoo  USE="-doc -hscolour -profile {-test}" 9 KiB
[ebuild  rR    ] dev-haskell/resourcet-0.4.9:0/0.4.9::gentoo  USE="-doc -hscolour -profile {-test}" 0 KiB
[ebuild  rR    ] dev-haskell/aeson-0.6.2.1:0/0.6.2.1::gentoo  USE="-developer -doc -hscolour -profile {-test}" 0 KiB
[ebuild  rR    ] dev-haskell/http-types-0.8.3:0/0.8.3::gentoo  USE="-doc -hscolour -profile {-test}" 0 KiB
[ebuild  r  U  ] dev-haskell/resourcet-1.1.2.2:0/1.1.2.2::gentoo [0.4.9:0/0.4.9::gentoo] USE="-doc -hscolour -profile {-test}" 11 KiB
[ebuild  N     ] dev-haskell/enclosed-exceptions-1.0.1.1:0/1.0.1.1::gentoo  USE="-doc -hscolour -profile {-test}" 5 KiB
[ebuild  rR    ] dev-haskell/conduit-1.0.9.3:0/1.0.9.3::gentoo  USE="-doc -hscolour -nohandles -profile {-test}" 0 KiB
[ebuild  r  U  ] dev-haskell/conduit-1.1.6:0/1.1.6::gentoo [1.0.9.3:0/1.0.9.3::gentoo] USE="-doc -hscolour -profile {-test} (-nohandles%)" 31 KiB
[ebuild  r  U  ] dev-haskell/yaml-0.8.10.1:0/0.8.10.1::gentoo [0.8.5.2:0/0.8.5.2::gentoo] USE="unicode%* -doc -hscolour -no-exe -profile -system-libyaml {-test}" 72 KiB
[ebuild  rR    ] dev-haskell/blaze-builder-conduit-1.0.0:0/1.0.0::gentoo  USE="-doc -hscolour -profile {-test}" 0 KiB
[ebuild  rR    ] dev-haskell/http-conduit-1.9.5.1:0/1.9.5.1::gentoo  USE="-doc -hscolour -profile {-test}" 0 KiB
[ebuild  rR    ] app-text/pandoc-1.12.1-r1:0/1.12.1::gentoo  USE="http-conduit -doc -embed_data_files -hscolour -profile {-test}" 0 KiB
[ebuild     U  ] app-emulation/libvirt-glib-0.2.1::gentoo [0.2.0::gentoo] USE="introspection python vala" PYTHON_TARGETS="python2_7" 825 KiB

Total: 26 packages (5 upgrades, 5 new, 16 reinstalls), Size of downloads: 1114 KiB

!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:

dev-haskell/conduit:0

  (dev-haskell/conduit-1.1.6:0/1.1.6::gentoo, ebuild scheduled for merge) pulled in by
    >=dev-haskell/conduit-1.1.0:=[profile?] required by (dev-haskell/yaml-0.8.10.1:0/0.8.10.1::gentoo, ebuild scheduled for merge)
    ^^                    ^^^^^                                                                                                                                                                             

  (dev-haskell/conduit-1.0.9.3:0/1.0.9.3::gentoo, ebuild scheduled for merge) pulled in by
    <dev-haskell/conduit-1.1:=[profile?] required by (dev-haskell/http-conduit-1.9.5.1:0/1.9.5.1::gentoo, ebuild scheduled for merge)
    ^                    ^^^ ^                                                                                                                                                                                 
    =dev-haskell/conduit-1.0*:=[profile?] required by (dev-haskell/blaze-builder-conduit-1.0.0:0/1.0.0::gentoo, ebuild scheduled for merge)
    ^                    ^^^^                                                                                                                                                                                        
    =dev-haskell/conduit-1.0*:0/1.0.9.3= required by (dev-haskell/zlib-conduit-1.0.0:0/1.0.0::gentoo, installed)
    ^                    ^^^^^^^^^^^^^^^                                                                                                                                                  
    =dev-haskell/conduit-1.0*:=[profile?] required by (dev-haskell/zlib-conduit-1.0.0:0/1.0.0::gentoo, installed)
    ^                    ^^^^                                                                                                                                                              

dev-haskell/resourcet:0

  (dev-haskell/resourcet-1.1.2.2:0/1.1.2.2::gentoo, ebuild scheduled for merge) pulled in by
    >=dev-haskell/resourcet-1.1:=[profile?] required by (dev-haskell/conduit-1.1.6:0/1.1.6::gentoo, ebuild scheduled for merge)
    ^^                      ^^^                                                                                                                                                                          

  (dev-haskell/resourcet-0.4.9:0/0.4.9::gentoo, ebuild scheduled for merge) pulled in by
    <dev-haskell/resourcet-0.5:=[profile?] required by (dev-haskell/conduit-1.0.9.3:0/1.0.9.3::gentoo, ebuild scheduled for merge)
    ^                      ^^^ ^                                                                                                                                                                            
    <dev-haskell/resourcet-0.5:=[profile?] required by (dev-haskell/http-conduit-1.9.5.1:0/1.9.5.1::gentoo, ebuild scheduled for merge)
    ^                      ^^^ ^                                                                                                                                                                                 

dev-haskell/text:0

  (dev-haskell/text-1.1.1.3:0/1.1.1.3::gentoo, ebuild scheduled for merge) pulled in by
    (no parents that aren't satisfied by other packages in this slot)

  (dev-haskell/text-0.11.3.1:0/0.11.3.1::gentoo, ebuild scheduled for merge) pulled in by
    <dev-haskell/text-1.1:=[profile?] required by (dev-haskell/semigroups-0.12.1:0/0.12.1::gentoo, installed)
    ^                 ^^^ ^                                                                                                                                                            
    <dev-haskell/text-1.1:0/0.11.3.1= required by (dev-haskell/blaze-markup-0.5.1.6:0/0.5.1.6::gentoo, installed)
    ^                 ^^^^^^^^^^^^^^^                                                                                                                                                      
    >=dev-haskell/text-0.2:0/0.11.3.1= required by (dev-haskell/parsec-3.1.4:0/3.1.4::gentoo, installed)
                          ^^^^^^^^^^^^                                                                                                      
    >=dev-haskell/text-0.10:0/0.11.3.1= required by (dev-haskell/blaze-html-0.6.1.2:0/0.6.1.2::gentoo, installed)
                           ^^^^^^^^^^^^                                                                                                              
    <dev-haskell/text-1.1:=[profile?] required by (dev-haskell/parsec-3.1.4:0/3.1.4::gentoo, installed)
    ^                 ^^^ ^                                                                                                                                                      
    <dev-haskell/text-1.1:=[profile?] required by (dev-haskell/blaze-markup-0.5.1.6:0/0.5.1.6::gentoo, installed)
    ^                 ^^^ ^                                                                                                                                                                
    <dev-haskell/text-1.1:0/0.11.3.1= required by (dev-haskell/parsec-3.1.4:0/3.1.4::gentoo, installed)
    ^                 ^^^^^^^^^^^^^^^                                                                                                                                            
    >=dev-haskell/text-0.10:0/0.11.3.1= required by (dev-haskell/semigroups-0.12.1:0/0.12.1::gentoo, installed)
                           ^^^^^^^^^^^^                                                                                                            
    >=dev-haskell/text-0.10:0/0.11.3.1= required by (dev-haskell/blaze-markup-0.5.1.6:0/0.5.1.6::gentoo, installed)
                           ^^^^^^^^^^^^                                                                                                                
    <dev-haskell/text-1.1:=[profile?] required by (dev-haskell/blaze-html-0.6.1.2:0/0.6.1.2::gentoo, installed)
    ^                 ^^^ ^                                                                                                                                                              
    <dev-haskell/text-1.1:0/0.11.3.1= required by (dev-haskell/blaze-html-0.6.1.2:0/0.6.1.2::gentoo, installed)
    ^                 ^^^^^^^^^^^^^^^                                                                                                                                                    
    <dev-haskell/text-1.1:0/0.11.3.1= required by (dev-haskell/semigroups-0.12.1:0/0.12.1::gentoo, installed)
    ^                 ^^^^^^^^^^^^^^^                                                                                                                                                  


It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously.  If such a conflict exists in
the dependencies of two different packages, then those packages can
not be installed simultaneously. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.

For more information, see MASKED PACKAGES section in the emerge man
page or refer to the Gentoo Handbook.


The following packages are causing rebuilds:

  (dev-haskell/conduit-1.1.6:0/1.1.6::gentoo, ebuild scheduled for merge) causes rebuilds for:
    (dev-haskell/yaml-0.8.10.1:0/0.8.10.1::gentoo, ebuild scheduled for merge)
  (dev-haskell/yaml-0.8.10.1:0/0.8.10.1::gentoo, ebuild scheduled for merge) causes rebuilds for:
    (app-text/pandoc-1.12.1-r1:0/1.12.1::gentoo, ebuild scheduled for merge)
  (dev-haskell/resourcet-1.1.2.2:0/1.1.2.2::gentoo, ebuild scheduled for merge) causes rebuilds for:
    (dev-haskell/conduit-1.1.6:0/1.1.6::gentoo, ebuild scheduled for merge)
  (dev-haskell/text-1.1.1.3:0/1.1.1.3::gentoo, ebuild scheduled for merge) causes rebuilds for:
    (dev-haskell/blaze-builder-conduit-1.0.0:0/1.0.0::gentoo, ebuild scheduled for merge)
    (dev-haskell/conduit-1.0.9.3:0/1.0.9.3::gentoo, ebuild scheduled for merge)
zsh: exit 1     emerge -pDvu --verbose-conflicts world