Here I come again. You were right, gcc-c++ wasn't installed. After installing it I have tried again and now I get another kind of error (my system is in spanish sorry):

[root@brigida srpm]# rpmbuild --rebuild wxhaskell-0.9.4-1.src.rpm
Installing wxhaskell-0.9.4-1.src.rpm
warning: user petersen does not exist - using root
warning: group petersen does not exist - using root
warning: user petersen does not exist - using root
warning: group petersen does not exist - using root
warning: user petersen does not exist - using root
warning: group petersen does not exist - using root
Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.12579
+ umask 022
+ cd /usr/src/redhat/BUILD
+ cd /usr/src/redhat/BUILD
+ rm -rf wxhaskell-0.9.4
+ /usr/bin/unzip -qq /usr/src/redhat/SOURCES/wxhaskell-src-0.9.4.zip
+ STATUS=0
+ '[' 0 -ne 0 ']'
+ cd wxhaskell-0.9.4
++ /usr/bin/id -u
+ '[' 0 = 0 ']'
+ /bin/chown -Rhf root .
++ /usr/bin/id -u
+ '[' 0 = 0 ']'
+ /bin/chgrp -Rhf root .
+ /bin/chmod -Rf a+rX,u+w,g-w,o-w .
+ exit 0
Executing(%build): /bin/sh -e /var/tmp/rpm-tmp.47335
+ umask 022
+ cd /usr/src/redhat/BUILD
+ cd wxhaskell-0.9.4
+ ./configure --hc=ghc-6.4 --hcpkg=ghc-pkg-6.4 --libdir=/usr/lib/ghc-6.4/wx --with-opengl
checking system:
 wx-config found
 ghc-6.4 found
 ghc-pkg-6.4 found
 haddock found
 install program found

creating configuration files:
 config
 config/config.mk
 config/wxcore.pkg
 config/wx.pkg
 config/wxhaskell-register.bat
 config/wxhaskell-unregister.bat
 config/setcd
 config/macosx-install.info
 config/macosx-postinstall
 config/macosx-app
 config/wxhaskell.spec
 config/prologue.txt
 config/cache.txt

configuration:
 library:     wxhaskell-0.9.4  (release 0)
 compiler:    ghc-6.4
 wxwidgets:   gtk-2.6.3
 with openGL: yes
 library dir: /usr/lib/ghc-6.4/wx

done:
 type 'make' to build wxhaskell.
 type 'make install' to install wxhaskell.
 type 'make help' to receive help on all other make targets

+ make all doc
g++ -c wxc/src/ewxw_main.cpp -o out/wxc/ewxw_main.o -MD -I/usr/lib/wx/include/gtk2-unicode-release-2.6 -I/usr/include/wx-2.6 -DGTK_NO_CHECK_CASTS -D__WXGTK__ -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -DNO_GCC_PRAGMA   -Iwxc/include
wxc/include/wrapper.h: In constructor ‘ELJDragDataObject::ELJDragDataObject(void*, char*, int (*)(void*), int (*)(void*, void*), int (*)(void*, int, const void*))’:
wxc/include/wrapper.h:172: error: no se encuentra una función coincidente para la llamada a ‘wxDataObjectSimple::wxDataObjectSimple(char*&)’
/usr/include/wx-2.6/wx/dataobj.h:249: nota: los candidatos son: wxDataObjectSimple::wxDataObjectSimple(const wxDataObjectSimple&)
/usr/include/wx-2.6/wx/dataobj.h:202: nota:                     wxDataObjectSimple::wxDataObjectSimple(const wxDataFormat&)
wxc/include/wrapper.h: In constructor ‘ELJTextValidator::ELJTextValidator(void*, void*, void*, long int)’:
wxc/include/wrapper.h:257: error: ambiguous overload para ‘operator=’ en ‘((ELJTextValidator*)this)->ELJTextValidator::buf = (const char*)_txt’
/usr/include/wx-2.6/wx/string.h:627: nota: los candidatos son: wxString& wxString::operator=(int) <coincidencia cercana>
/usr/include/wx-2.6/wx/string.h:846: nota:                     wxString& wxString::operator=(wxChar) <coincidencia cercana>
/usr/include/wx-2.6/wx/string.h:860: nota:                     wxString& wxString::operator=(const wxWCharBuffer&) <coincidencia cercana>
/usr/include/wx-2.6/wx/string.h:611: nota:                     wxString& wxString::operator=(const wxString&) <coincidencia cercana>
wxc/include/wrapper.h: At global scope:
wxc/include/wrapper.h:330: error: tipos de devolución en conflicto especificados para ‘virtual char* ELJConnection::OnRequest(const wxString&, const wxString&, int*, wxIPCFormat)’
/usr/include/wx-2.6/wx/ipcbase.h:85: error:   sustituyendo ‘virtual wxChar* wxConnectionBase::OnRequest(const wxString&, const wxString&, int*, wxIPCFormat)’
wxc/include/wrapper.h: In constructor ‘ELJConnection::ELJConnection(char*, int)’:
wxc/include/wrapper.h:300: error: no se encuentra una función coincidente para la llamada a ‘wxTCPConnection::wxTCPConnection(char*&, int&)’
/usr/include/wx-2.6/wx/sckipc.h:106: nota: los candidatos son: wxTCPConnection::wxTCPConnection(const wxTCPConnection&)
/usr/include/wx-2.6/wx/sckipc.h:65: nota:                     wxTCPConnection::wxTCPConnection()
/usr/include/wx-2.6/wx/sckipc.h:64: nota:                     wxTCPConnection::wxTCPConnection(wxChar*, int)
wxc/include/wrapper.h: In constructor ‘ELJPrintout::ELJPrintout(void*, void*, void*, void*, void*, void*, void*, void*, void*, void*)’:
wxc/include/wrapper.h:412: error: la conversión de ‘char*’ a ‘const wxString’ es ambigua
/usr/include/wx-2.6/wx/string.h:643: nota: los candidatos son: wxString::wxString(wxChar, size_t) <coincidencia cercana>
/usr/include/wx-2.6/wx/string.h:633: nota:                     wxString::wxString(int) <coincidencia cercana>
wxc/include/wrapper.h: In constructor ‘ELJPreviewFrame::ELJPreviewFrame(void*, void*, void*, void*, void*, void*, void*, int, int, int, int, int)’:
wxc/include/wrapper.h:474: error: la conversión de ‘char*’ a ‘const wxString’ es ambigua
/usr/include/wx-2.6/wx/string.h:643: nota: los candidatos son: wxString::wxString(wxChar, size_t) <coincidencia cercana>
/usr/include/wx-2.6/wx/string.h:633: nota:                     wxString::wxString(int) <coincidencia cercana>
wxc/include/wrapper.h: At global scope:
wxc/include/wrapper.h:534: error: el argumento por defecto para el parámetro del tipo ‘const wxString&’ tiene el tipo ‘const char [11]’
make: *** [out/wxc/ewxw_main.o] Error 1
error: Bad exit status from /var/tmp/rpm-tmp.47335 (%build)


RPM build errors:
    user petersen does not exist - using root
    group petersen does not exist - using root
    user petersen does not exist - using root
    group petersen does not exist - using root
    user petersen does not exist - using root
    group petersen does not exist - using root
    Bad exit status from /var/tmp/rpm-tmp.47335 (%build)

Thanks everybody for your help



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