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diff -up qtbase-opensource-src-5.6.0/mkspecs/common/gcc-base.conf.than qtbase-opensource-src-5.6.0/mkspecs/common/gcc-base.conf
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--- qtbase-opensource-src-5.6.0/mkspecs/common/gcc-base.conf.than	2016-06-02 17:30:07.249027901 +0200
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+++ qtbase-opensource-src-5.6.0/mkspecs/common/gcc-base.conf	2016-06-02 17:30:14.681748012 +0200
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@@ -32,7 +32,7 @@
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 #
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 QMAKE_CFLAGS_OPTIMIZE      = -O2
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-QMAKE_CFLAGS_OPTIMIZE_FULL = -O3
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+QMAKE_CFLAGS_OPTIMIZE_FULL = -O2
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 QMAKE_CFLAGS               += -pipe
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 QMAKE_CFLAGS_DEPS          += -M