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diff --git a/solenv/gbuild/platform/linux-S390.mk b/solenv/gbuild/platform/linux-S390.mk
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index 410038e..fae49f4 100755
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--- a/solenv/gbuild/platform/linux-S390.mk
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+++ b/solenv/gbuild/platform/linux-S390.mk
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@@ -28,7 +28,7 @@
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 #*************************************************************************
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 #please make generic modifications to unxgcc.mk or linux.mk
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-gb_CPUDEFS += -D$(CPUNAME)
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+gb_CPUDEFS += -DS390
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 gb_Library_DLLPOSTFIX := l3
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 gb_COMPILERDEFAULTOPTFLAGS := -O2
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 gb_CXXFLAGS += -fsigned-char -fno-omit-frame-pointer