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Hello, I installed GHC 7.4.2 using the package manager.
Using ghci I can run some code examples successfully, but trying to compile them throws
an error complaining about a missing file.

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[javier@localhost ch01]$ ghc -o WC WC.hs
Linking WC ...

/tmp/ghc4372_0/ghc4372_0.c:1:17:
     error fatal: Rts.h: No existe el fichero o el directorio
compilación terminada.


So the compiler doesn't seem able to find Rts.h. A quick search using find revealed it to be in the /usr/lib64/ghc-7.4.2/include directory.

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[javier@localhost ch01]$ find /usr -type f -name 'Rts.h'
/usr/lib64/ghc-7.4.2/include/Rts.h


So I added the -I option to add the directory to the search list.

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[javier@localhost ch01]$ ghc -I/usr/lib64/ghc-7.4.2/include --make WC
[1 of 1] Compiling Main             ( WC.hs, WC.o )
Linking WC ...

/tmp/ghc4521_0/ghc4521_0.c:1:17:
     error fatal: Rts.h: No existe el fichero o el directorio
compilación terminada.
[javier@localhost ch01]$


However that fails too! I've searched Google without finding anything helpful.
Anyone has an idea of what might be going on?

Then please report that as a bug, after searching if it hasn't been reported yet already: https://wiki.mageia.org/en/How_to_report_a_bug_properly

For anyone who may be interested I filled a bug: https://bugs.mageia.org/show_bug.cgi?id=10220