[Howto] Building Qt 5.2.1 (including Webkit) on RHEL5 (Linux CentOS 5.7)

xroche

Hi folks!

Just few notes on how to build Qt (+Webkit) on Red Hat Linux 5 flavors (tested on an up-to-date CentOS 5.7)

This message might be useful for folks who want to build a recent Qt version on older architectures without too much troubles - the problem being that many required packages are often out-of-date (such as binutils, flex, etc.)

Diagnostic messages are sometimes a bit hard to track when a dependency is missing (such as "Project ERROR: Unknown module(s) in QT: quick"), and sometimes Webkit build will just be skipped, too.

You'll have to adapt the given information to your needs (especially the patches provided below), but it may help people who are stuck on a build :)

Remarks, improvements and (un)successful builds reports are welcome!

Link to the correct compiler (ie. not GCC 4.1.*)

There is probably a much cleaner way to do this, by the way - but it will do the trick for now:

@
if gcc --version | grep -q 4.1 ; then
mkdir /tmp/gcc
ln -s /usr/bin/gcc44 /tmp/gcc/gcc
ln -s /usr/bin/g++44 /tmp/gcc/g++
export PATH=/tmp/gcc:$PATH
hash -r
fi
@

Assuming GCC 4.4 has been installed, of course

Download dependencies

Some of them might be unneeded (especially certain XCB components) through...

@

Download packages (versions may vary)

Dependencies build: gperf, icu ...

@

Prepare target

TARGET=$PWD/qt5-install
export PATH=${TARGET}/usr/local/bin:$PATH
export LD_LIBRARY_PATH=${TARGET}/usr/local/lib
@

@

Build ICU

tar xvf icu4c-50_1_2-src.tgz
cd icu/source
./configure && make -j16 && make install DESTDIR=${TARGET}
cd ../..
@

@

Build the rest

configopt=()
configopt['libxml2']="--without-python"
for i in
sqlite-autoconf-3080300.tar.gz
flex-2.5.37.tar.gz
gperf-3.0.4.tar.gz
libxml2-2.9.1.tar.gz
xcb-proto-1.10.tar.gz
libpthread-stubs-0.1.tar.gz
xproto-7.0.25.tar.gz
libxcb-1.10.tar.gz
xcb-util-0.3.9.tar.gz
xcb-util-image-0.3.9.tar.gz
xcb-util-keysyms-0.3.9.tar.gz
xcb-util-wm-0.4.0.tar.gz
xcb-util-renderutil-0.3.8.tar.gz
xcb-util-cursor-0.1.1.tar.gz
; do
test -d ${i%..} && continue
log=${i%..}.log
printf "*** Building $i ... " >&2
if (
tar xvf $i
&& cd ${i%..}
&& PKG_CONFIG_PATH="${TARGET}/usr/local/lib/pkgconfig"
./configure -prefix ${TARGET}/usr/local ${configopt[${i%%-*}]}
&& make
&& make install
&& cd ..
|| exit 1 ) >${log} 2>&1 ; then
echo "OK" >&2
else
echo "ERROR" >&2
cat ${log}
exit 1
fi
done
echo "All done" >&2
@

xroche

(Part 2)

Qt 5.2.1 build

@

decompress qt

tar xvfz qt-everywhere-opensource-src-5.2.1.tar.gz
cd qt-everywhere-opensource-src-5.2.1
@

Unfortunately, I had to patch the sources a bit (!):

to handle old OpenSSL (0.9.*) release
to handle missing GCC features
to handle older X11 API
to handle some hardcoded pathes
to handle ar missing T flag
to handle old glibc insanity over pthread_xxx

Note: ★ must be replaced by the 'at' character, because the forum doesn't seem to have a way to escape them properly. Beware that some diff are broken due to tab/space being mangled by the forum, too :) See "the original diff":http://private.httrack.com/patch/qt5.2.1_rhel5_build_patch.diff

@
patch -p0 << EOF
--- ./qtbase/src/testlib/3rdparty/linux_perf_event_p.h.orig 2014-02-01 20:35:39.000000000 +0100
+++ ./qtbase/src/testlib/3rdparty/linux_perf_event_p.h 2014-02-06 14:25:38.000000000 +0100
★★ -14,6 +14,7 ★★
#ifndef _UAPI_LINUX_PERF_EVENT_H
#define _UAPI_LINUX_PERF_EVENT_H

+#undef STRICT_ANSI
#include <linux/types.h>
#include <linux/ioctl.h>
#include <asm/byteorder.h>
EOF
@

@
patch -p0 << EOF
--- ./qtbase/src/network/ssl/qsslcontext.cpp.orig 2014-02-06 14:30:24.000000000 +0100
+++ ./qtbase/src/network/ssl/qsslcontext.cpp 2014-02-06 14:30:35.000000000 +0100
★★ -311,7 +311,7 ★★
unsigned char *data = reinterpret_cast<unsigned char *>(m_sessionASN1.data());
if (!q_i2d_SSL_SESSION(session, &data))
qWarning("could not store persistent version of SSL session");

       m_sessionTicketLifeTimeHint = session->tlsext_tick_lifetime_hint;

       //m_sessionTicketLifeTimeHint = session->tlsext_tick_lifetime_hint;
   }

}
EOF
@

@
patch -p0 << EOF
--- ./qtbase/src/network/ssl/qsslsocket_openssl.cpp.orig 2014-02-06 14:47:04.000000000 +0100
+++ ./qtbase/src/network/ssl/qsslsocket_openssl.cpp 2014-02-06 14:47:19.000000000 +0100
★★ -1431,8 +1431,8 ★★
if (readBufferMaxSize)
plainSocket->setReadBufferSize(readBufferMaxSize);

if (q_SSL_ctrl((ssl), SSL_CTRL_GET_SESSION_REUSED, 0, NULL))

   configuration.peerSessionShared = true;

//if (q_SSL_ctrl((ssl), SSL_CTRL_GET_SESSION_REUSED, 0, NULL))
// configuration.peerSessionShared = true;

#ifdef QT_DECRYPT_SSL_TRAFFIC
if (ssl->session && ssl->s3) {
EOF
@

@
patch -p0 << EOF
--- ./qtbase/src/3rdparty/xcb/include/xcb/xcb_pixel.h.orig 2014-02-01 20:35:35.000000000 +0100
+++ ./qtbase/src/3rdparty/xcb/include/xcb/xcb_pixel.h 2014-02-11 11:11:18.000000000 +0100
★★ -33,6 +33,9 ★★
#include <xcb/xcb_image.h>
#endif

+#undef _X_INLINE
+#define _X_INLINE
+
/**

XCB Image fast pixel ops.

EOF
@

@
patch -p0 << EOF
--- ./qtbase/src/3rdparty/xcb/include/xcb/xcb_bitops.h.orig 2014-02-01 20:35:35.000000000 +0100
+++ ./qtbase/src/3rdparty/xcb/include/xcb/xcb_bitops.h 2014-02-11 11:10:48.000000000 +0100
★★ -38,6 +38,9 ★★

★{
*/

+#undef _X_INLINE
+#define _X_INLINE
+

/**

Create a low-order bitmask.
EOF
@

@
patch -p0 << EOF
--- ./qtbase/src/plugins/platforms/offscreen/qoffscreenintegration_x11.cpp.orig 2014-02-01 20:35:39.000000000 +0100
+++ ./qtbase/src/plugins/platforms/offscreen/qoffscreenintegration_x11.cpp 2014-02-13 08:06:37.043558016 +0100
★★ -52,6 +52,8 ★★
#include <qpa/qplatformsurface.h>
#include <qsurface.h>

+#include <stdio.h>
+
QT_BEGIN_NAMESPACE

QOffscreenIntegration *QOffscreenIntegration::createOffscreenIntegration()
★★ -231,7 +233,9 ★★

void (*QOffscreenX11GLXContext::getProcAddress(const QByteArray &procName)) ()
{

return (void (*)())glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(procName.constData()));

//return (void (*)())glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(procName.constData()));
fprintf(stderr, "** QOffscreenX11GLXContext::getProcAddress() called, but no support compiled\n");
return NULL;
}

QSurfaceFormat QOffscreenX11GLXContext::format() const
EOF
@

@

hardcoded libxml2 include directory, sheesh

patch -p0 << EOF
--- ./qtwebkit/Tools/qmake/config.tests/libxml2/libxml2.pro.orig 2014-02-01 20:35:44.000000000 +0100
+++ ./qtwebkit/Tools/qmake/config.tests/libxml2/libxml2.pro 2014-02-12 08:09:27.000000000 +0100
★★ -1,9 +1,11 ★★
CONFIG -= qt
SOURCES = libxml2.cpp
mac {

QMAKE_CXXFLAGS += -iwithsysroot /usr/include/libxml2

QMAKE_CXXFLAGS += -iwithsysroot ${TARGET}/usr/local/include/libxml2
LIBS += -lxml2
} else {
QMAKE_CXXFLAGS += -I ${TARGET}/usr/local/include/libxml2
QMAKE_LFLAGS += -L ${TARGET}/usr/local/lib
PKGCONFIG += libxml-2.0
CONFIG += link_pkgconfig
}
EOF
@

@
patch -p0 << EOF
--- ./qtwebkit/Tools/qmake/config.tests/libxslt/libxslt.pro.orig 2014-02-01 20:35:44.000000000 +0100
+++ ./qtwebkit/Tools/qmake/config.tests/libxslt/libxslt.pro 2014-02-12 08:09:59.000000000 +0100
★★ -1,9 +1,11 ★★
CONFIG -= qt
SOURCES = libxslt.cpp
mac {

QMAKE_CXXFLAGS += -iwithsysroot /usr/include/libxslt -iwithsysroot /usr/include/libxml2

QMAKE_CXXFLAGS += -iwithsysroot /usr/include/libxslt -iwithsysroot ${TARGET}/usr/local/include/libxml2
LIBS += -lxslt
} else {
QMAKE_CXXFLAGS += -I ${TARGET}/usr/local/include/libxml2
QMAKE_LFLAGS += -L ${TARGET}/usr/local/lib
PKGCONFIG += libxslt
CONFIG += link_pkgconfig
}
EOF
@

xroche

(part 3)

@
patch -p0 << EOF
--- qtwebkit/Source/WebCore/WebCore.pri.orig 2014-02-01 20:35:46.000000000 +0100
+++ qtwebkit/Source/WebCore/WebCore.pri 2014-02-12 08:10:37.000000000 +0100
★★ -112,9 +112,11 ★★
enable?(XSLT) {
use?(LIBXML2) {
mac {

       QMAKE_CXXFLAGS += -iwithsysroot /usr/include/libxslt -iwithsysroot /usr/include/libxml2

       QMAKE_CXXFLAGS += -iwithsysroot /usr/include/libxslt -iwithsysroot ${TARGET}/usr/local/include/libxml2
       LIBS += -lxml2 -lxslt
   } else {

       QMAKE_CXXFLAGS += -I ${TARGET}/usr/local/include/libxml2

       QMAKE_LFLAGS += -L ${TARGET}/usr/local/lib
       PKGCONFIG += libxslt libxml-2.0
   }

} else {
EOF
@

@
patch -p0 << EOF
--- qtwebkit/Source/WebCore/Configurations/WebCore.xcconfig.orig 2014-02-01 20:35:54.000000000 +0100
+++ qtwebkit/Source/WebCore/Configurations/WebCore.xcconfig 2014-02-11 17:11:11.000000000 +0100
★★ -46,7 +46,7 ★★
STAGED_FRAMEWORKS_SEARCH_PATH = $(STAGED_FRAMEWORKS_SEARCH_PATH_$(USE_STAGING_INSTALL_PATH));
STAGED_FRAMEWORKS_SEARCH_PATH_YES = $(NEXT_ROOT)$(SYSTEM_LIBRARY_DIR)/StagedFrameworks/Safari;

-HEADER_SEARCH_PATHS = ForwardingHeaders icu /usr/include/libxslt /usr/include/libxml2 "${BUILT_PRODUCTS_DIR}/DerivedSources/WebCore" "${BUILT_PRODUCTS_DIR}/usr/local/include" $(HEADER_SEARCH_PATHS);
+HEADER_SEARCH_PATHS = ForwardingHeaders icu /usr/include/libxslt ${TARGET}/usr/local/include/libxml2 "${BUILT_PRODUCTS_DIR}/DerivedSources/WebCore" "${BUILT_PRODUCTS_DIR}/usr/local/include" $(HEADER_SEARCH_PATHS);
INFOPLIST_FILE = Info.plist;
INSTALL_PATH = $(INSTALL_PATH_$(PLATFORM_NAME));
INSTALL_PATH_iphoneos = $(SYSTEM_LIBRARY_DIR)/PrivateFrameworks;
EOF
@

@

ar/binutils is too old on RH5 to support the 'T' flag

patch -p0 << EOF
--- qtwebkit/Source/WebKit2/GNUmakefile.am.orig 2014-02-01 20:35:59.000000000 +0100
+++ qtwebkit/Source/WebKit2/GNUmakefile.am 2014-02-12 11:17:13.000000000 +0100
★★ -588,7 +588,7 ★★
WebCoreLayerGtk2.a: $(webcore_layer_gtk2_deps)
$(AM_V_GEN)
$(AM_V_at)$(shell rm -f $★)

$(AM_V_at)$(foreach archive, $(webcore_layer_gtk2_archives), $(shell ar t $(archive) | xargs -n50 ar cruT $★))

$(AM_V_at)$(foreach archive, $(webcore_layer_gtk2_archives), $(shell ar t $(archive) | xargs -n50 ar cru $★))

DISTCLEANFILES +=
$(top_builddir)/WebCoreLayerGtk2.a
EOF
@

@
patch -p0 << EOF
--- qtwebkit/Tools/TestWebKitAPI/GNUmakefile.am.orig 2014-02-01 20:35:44.000000000 +0100
+++ qtwebkit/Tools/TestWebKitAPI/GNUmakefile.am 2014-02-12 11:18:28.000000000 +0100
★★ -122,7 +122,7 ★★
WebCoreLayer.a: $(webcore_layer_deps)
$(AM_V_GEN)
$(AM_V_at)$(shell rm -f $★)

$(AM_V_at)$(foreach archive, $(webcore_layer_archives), $(shell ar t $(archive) | xargs -n50 ar cruT $★))

$(AM_V_at)$(foreach archive, $(webcore_layer_archives), $(shell ar t $(archive) | xargs -n50 ar cru $★))

DISTCLEANFILES +=
$(top_builddir)/WebCoreLayer.a
EOF
@

@
patch -p0 << EOF
--- qtwebkit/Tools/qmake/mkspecs/features/default_post.prf.orig 2014-02-01 20:35:44.000000000 +0100
+++ qtwebkit/Tools/qmake/mkspecs/features/default_post.prf 2014-02-12 11:22:10.000000000 +0100
★★ -275,7 +275,7 ★★
# Replace the hardcoded archiver command line
# options to use GNU ar's thin archive format.
AR_COMMAND = $$split(QMAKE_AR, " ")

   QMAKE_AR = \$\$member(AR_COMMAND, 0) cruT

```
   QMAKE_AR = \$\$member(AR_COMMAND, 0) cru
```
}

isEmpty(DESTDIR): DESTDIR = $$targetSubDir()
EOF
@

@
patch -p0 << EOF
--- qtwebkit/Source/autotools/SetupLibtool.m4.orig 2014-02-01 20:35:58.000000000 +0100
+++ qtwebkit/Source/autotools/SetupLibtool.m4 2014-02-12 11:23:09.000000000 +0100
★★ -6,7 +6,7 ★★
AC_SUBST([LIBWEBKIT2GTK_VERSION])

if test -z "$AR_FLAGS"; then

AR_FLAGS="cruT"

AR_FLAGS="cru"
fi

DOLT
EOF
@

@

missing O_CLOEXEC/FD_CLOEXEC

patch -p0 << EOF
--- qtwebkit/Source/WebKit2/Platform/unix/SharedMemoryUnix.cpp.orig 2014-02-01 20:35:59.000000000 +0100
+++ qtwebkit/Source/WebKit2/Platform/unix/SharedMemoryUnix.cpp 2014-02-12 14:54:53.357149313 +0100
★★ -48,6 +48,13 ★★
#include <linux/ashmem.h>
#endif

+#ifndef O_CLOEXEC
+#define O_CLOEXEC 02000000 /* set close_on_exec /
+#endif
+#ifndef FD_CLOEXEC
+#define FD_CLOEXEC 1 / actually anything with low bit set goes */
+#endif
+
namespace WebKit {

SharedMemory::Handle::Handle()
EOF
@

@

fixing GCC weird issue (possible bug)

patch -p0 << EOF
--- ./qtbase/src/corelib/tools/qmap.h.orig 2014-02-01 20:35:38.000000000 +0100
+++ ./qtbase/src/corelib/tools/qmap.h 2014-02-13 11:42:06.000000000 +0100
★★ -131,8 +131,10 ★★
QMapNode<Key, T> *lowerBound(const Key &key);
QMapNode<Key, T> *upperBound(const Key &key);

-private:
+//private:
+///QtCore/qmap.h:112: error: 'struct QMapNode<Key, T>' only defines private constructors and has no friends
QMapNode() Q_DECL_EQ_DELETE;
+private:
Q_DISABLE_COPY(QMapNode)
};
@

xroche

(part 4)

(continuing patch)

@
cat << EOF > ${TARGET}/usr/local/include/pthread.h
#ifndef X_PTHREAD_PRIVATE_OVERRIDE
#define X_PTHREAD_PRIVATE_OVERRIDE
/* Override pthread_equal() to avoid missing symbol at link.

Possibly related to https://bugzilla.redhat.com/show_bug.cgi?id=102098
*/
#include "/usr/include/pthread.h"
#undef pthread_equal
#define pthread_equal pthread_equal_inlined
static int pthread_equal (pthread_t thread1, pthread_t thread2) attribute ((unused));
static int pthread_equal (pthread_t thread1, pthread_t thread2) {
return thread1 == thread2;
}
#endif
EOF
@

If you want to use --disable-rpath in configure scripts (-no-rpath with the Qt configure script), you also have to slightly patch the build scripts:

@

being able to use --disable-rpath in configure scripts

patch -p0 << EOF
--- qtbase/mkspecs/linux-g++/qmake.conf.orig 2014-02-01 20:35:40.000000000 +0100
+++ qtbase/mkspecs/linux-g++/qmake.conf 2014-02-13 10:38:31.000000000 +0100
★★ -6,6 +6,8 ★★
CONFIG += incremental gdb_dwarf_index
QMAKE_INCREMENTAL_STYLE = sublib

+QMAKE_LFLAGS = -Wl,-rpath-link=${TARGET}/usr/local/lib
+
include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)
EOF
@

@
patch -p0 << EOF
--- qtbase/mkspecs/linux-g++-64/qmake.conf.orig 2014-02-01 20:35:40.000000000 +0100
+++ qtbase/mkspecs/linux-g++-64/qmake.conf 2014-02-13 10:36:00.000000000 +0100
★★ -10,7 +10,7 ★★
QMAKE_INCREMENTAL_STYLE = sublib

QMAKE_CFLAGS = -m64
-QMAKE_LFLAGS = -m64
+QMAKE_LFLAGS = -m64 -Wl,-rpath-link=${TARGET}/usr/local/lib

include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
EOF
@

And the final build:

@

configure

./configure -v -shared -opensource -release -optimized-qmake -separate-debug-info -fontconfig -qt-libjpeg -qt-libpng -no-audio-backend -no-compile-examples -no-c++11 -icu -xcb -xcb-xlib
-prefix ${TARGET}
-I ${TARGET}/usr/local/include
-I ${TARGET}/usr/local/include/libxml2
-L ${TARGET}/usr/local/lib

build

make -j16 && make install || echo "failed to build"
@

aluchko

Thanks for the instructions but I haven't quite been able to get them working on a fresh CentOS 5.7 install on VirtualBox.

I collected them into a single script for convenience and reproducibility.
http://pastebin.com/8E9Tn2Nq

I added the packages gcc, gcc-c++, and libXau-devel

In addition I needed to add python 2.6 to the list of packages since it's required by a couple of the added dependencies.

Unfortunately this is still insufficient to create a functioning build and it fails with the following message.

@g++ -c -pipe -g -ffunction-sections -O2 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -D_REENTRANT -D QT_NO_MTDEV -DQT_NO_LIBUDEV -DQT_BOOTSTRAPPED -DQT_LITE_UNICODE -DQT_NO_CAST_TO_ASCII -DQT_NO_CODECS -DQT_NO_DATASTREAM -DQT_NO_LIBRAR Y -DQT_NO_QOBJECT -DQT_NO_SYSTEMLOCALE -DQT_NO_THREAD -DQT_NO_UNICODETABLES -DQT_NO_USING_NAMESPACE -DQT_NO_DEPRECATED -DQT_NO_TRANSLA TION -DQT_QMAKE_LOCATION="/home/vagrant/qt/qt-everywhere-opensource-src-5.2.1/qtbase/bin/qmake" -DQT_CRYPTOGRAPHICHASH_ONLY_SHA1 -DQ T_NO_CAST_FROM_ASCII -DQT_BUILD_BOOTSTRAP_LIB -DQT_BUILDING_QT -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_D EPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -I../../../mkspecs/linux-g++ -I. -I/home/vagrant/qt/qt5-install/usr/local/include -I/home/vagrant/qt/qt5-install/usr/local/include/lib xml2 -I../../../include -I../../../include/QtCore -I../../../include/QtXml -I../../../include/QtCore/5.2.1 -I../../../include/QtCore/5 .2.1/QtCore -I/home/vagrant/qt/qt-everywhere-opensource-src-5.2.1/qtbase/include/QtXml/5.2.1 -I/home/vagrant/qt/qt-everywhere-opensour ce-src-5.2.1/qtbase/include/QtXml/5.2.1/QtXml -I../../3rdparty/zlib -o .obj/qjsonparser.o ../../corelib/json/qjsonparser.cpp
make[3]: *** [.obj/qtextcodec.o] Killed
make[3]: *** Deleting file .obj/qtextcodec.o' make[3]: *** Waiting for unfinished jobs.... make[3]: *** [.obj/qutfcodec.o] Killed make[3]: *** Deleting file .obj/qutfcodec.o'
make[3]: *** [.obj/qglobal.o] Killed
make[3]: *** Deleting file .obj/qglobal.o' make[3]: *** [.obj/qlogging.o] Killed make[3]: *** Deleting file .obj/qlogging.o'
make[3]: *** [.obj/qfileinfo.o] Killed
make[3]: *** Deleting file .obj/qfileinfo.o' make[3]: *** [.obj/qfilesystemengine.o] Killed make[3]: *** Deleting file .obj/qfilesystemengine.o'
make[3]: *** [.obj/qcoreapplication.o] Killed
make[3]: *** Deleting file .obj/qcoreapplication.o' make[3]: *** [.obj/qvariant.o] Killed make[3]: *** Deleting file .obj/qvariant.o'
make[3]: *** [.obj/qdatetime.o] Killed
make[3]: *** Deleting file .obj/qdatetime.o' make[3]: *** [.obj/qhash.o] Killed make[3]: *** Deleting file .obj/qhash.o'
{standard input}: Assembler messages:
{standard input}:14755: Warning: end of file not at end of a line; newline inserted
{standard input}:16308: Error: invalid character '_' in mnemonic
g++: Internal error: Killed (program cc1plus)
Please submit a full bug report.
See URL:http://bugzilla.redhat.com/bugzilla for instructions.
make[3]: *** [.obj/qstring.o] Error 1
../../corelib/json/qjson_p.h: In member function ‘QString QJsonPrivate::String::toString() const’:
../../corelib/json/qjson_p.h:359: warning: dereferencing type-punned pointer will break strict-aliasing rules
../../corelib/json/qjsonvalue.cpp: In member function ‘int QJsonValue::toInt(int) const’:
../../corelib/json/qjsonvalue.cpp:462: warning: converting to ‘int’ from ‘const double’
../../corelib/json/qjson_p.h: In member function ‘QString QJsonPrivate::String::toString() const’:
../../corelib/json/qjson_p.h:359: warning: dereferencing type-punned pointer will break strict-aliasing rules
../../corelib/json/qjson_p.h: In member function ‘QString QJsonPrivate::String::toString() const’:
../../corelib/json/qjson_p.h:359: warning: dereferencing type-punned pointer will break strict-aliasing rules
../../corelib/json/qjson_p.h: In member function ‘QString QJsonPrivate::String::toString() const’:
../../corelib/json/qjson_p.h:359: warning: dereferencing type-punned pointer will break strict-aliasing rules
make[3]: Leaving directory /home/vagrant/qt/qt-everywhere-opensource-src-5.2.1/qtbase/src/tools/bootstrap' make[2]: *** [sub-bootstrap-make_first] Error 2 make[2]: Leaving directory /home/vagrant/qt/qt-everywhere-opensource-src-5.2.1/qtbase/src'
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory `/home/vagrant/qt/qt-everywhere-opensource-src-5.2.1/qtbase'
make: *** [module-qtbase-make_first] Error 2

echo 'failed to build'
failed to build
@

Do you have any ideas on how to proceed?