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From: Max Brazhnikov <makc@freebsd.org>
To: freebsd-ports@freebsd.org
Subject: Re: Stop in /usr/ports/devel/qt4-corelib.
Date: Mon, 11 Mar 2013 10:38:35 +0000
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Cc: Per olof Ljungmark <peo@intersonic.se>
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On Sat, 09 Mar 2013 22:23:58 +0100 Per olof Ljungmark wrote:
> FreeBSD 9.1-STABLE #0 r248028
> 
> Ports tree from an hour ago
> 
> The error is
> 
> g++ -c -O2 -pipe -fno-strict-aliasing -pthread
> -I/usr/local/include/glib-2.0 -I/usr/local/include -O2
> -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -pthread
> -D_THREAD_SAFE -fPIC -DQT_SHARED -DQT_BUILD_CORE_LIB
> -DQT_NO_USING_NAMESPACE -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS
> -DQT3_SUPPORT -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_USE_ICU
> -DHB_EXPORT=Q_CORE_EXPORT -DGNU_LIBICONV -DQT_NO_DEBUG -DQT_HAVE_MMX
> -DQT_HAVE_SSE -DQT_HAVE_MMXEXT -DQT_HAVE_SSE2 -DQT_HAVE_SSE3
> -DQT_HAVE_SSSE3 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE
> -I/usr/local/share/qt4/mkspecs/freebsd-g++ -I. -I../../include
> -I../../include/QtCore -I.rcc/release-shared -Iglobal
> -I../3rdparty/harfbuzz/src -I../3rdparty/md5 -I../3rdparty/md4
> -I.moc/release-shared -I/usr/local/include/qt4 -I/usr/local/include -o
> ..obj/release-shared/qglobal.o global/qglobal.cpp
> In file included from ../../include/QtCore/qatomic_arch.h:1,

..skip..

> .../../include/QtCore/../../src/corelib/tools/qbytearray.h: In function
> 'uint qstrlen(const char*)':
> .../../include/QtCore/../../src/corelib/tools/qbytearray.h:79: error:
> redefinition of 'uint qstrlen(const char*)'
> /usr/local/include/qcstring.h:57: error: 'uint qstrlen(const char*)'

The problem is that qt-3 installs headers directly to common path 
/usr/local/include and these headers are included instead of Qt4's.
As a workaroud you may deinstall qt-3, update your ports and then install qt3.

Max