diff --git a/solenv/gbuild/platform/LINUX_POWERPC64_GCC.mk b/solenv/gbuild/platform/LINUX_POWERPC64_GCC.mk
index 33f6bd1..08e7b23 100644
--- a/solenv/gbuild/platform/LINUX_POWERPC64_GCC.mk
+++ b/solenv/gbuild/platform/LINUX_POWERPC64_GCC.mk
@@ -28,8 +28,7 @@
 #please make generic modifications to unxgcc.mk or linux.mk
 gb_CPUDEFS += -DPPC
 gb_COMPILERDEFAULTOPTFLAGS := -O2
-gb_CXXFLAGS += -mminimal-toc -fsigned-char
-gb_CFLAGS += -fsigned-char
+gb_CXXFLAGS += -mminimal-toc
 
 include $(GBUILDDIR)/platform/linux.mk
 
diff --git a/solenv/gbuild/platform/LINUX_POWERPC_GCC.mk b/solenv/gbuild/platform/LINUX_POWERPC_GCC.mk
index 1c78df0..6fe92ec 100644
--- a/solenv/gbuild/platform/LINUX_POWERPC_GCC.mk
+++ b/solenv/gbuild/platform/LINUX_POWERPC_GCC.mk
@@ -28,8 +28,6 @@
 #please make generic modifications to unxgcc.mk or linux.mk
 gb_CPUDEFS += -DPPC
 gb_COMPILERDEFAULTOPTFLAGS := -O2
-gb_CXXFLAGS += -fsigned-char
-gb_CFLAGS += -fsigned-char
 
 include $(GBUILDDIR)/platform/linux.mk
 
diff --git a/solenv/gbuild/platform/LINUX_S390X_GCC.mk b/solenv/gbuild/platform/LINUX_S390X_GCC.mk
index b352572..1d6889e 100644
--- a/solenv/gbuild/platform/LINUX_S390X_GCC.mk
+++ b/solenv/gbuild/platform/LINUX_S390X_GCC.mk
@@ -27,8 +27,8 @@
 
 #please make generic modifications to unxgcc.mk or linux.mk
 gb_COMPILERDEFAULTOPTFLAGS := -O2
-gb_CXXFLAGS += -fsigned-char -fno-omit-frame-pointer
-gb_CFLAGS += -fsigned-char -fno-omit-frame-pointer
+gb_CXXFLAGS += -fno-omit-frame-pointer
+gb_CFLAGS += -fno-omit-frame-pointer
 
 include $(GBUILDDIR)/platform/linux.mk
 
diff --git a/solenv/gbuild/platform/LINUX_S390_GCC.mk b/solenv/gbuild/platform/LINUX_S390_GCC.mk
index b352572..1d6889e 100644
--- a/solenv/gbuild/platform/LINUX_S390_GCC.mk
+++ b/solenv/gbuild/platform/LINUX_S390_GCC.mk
@@ -27,8 +27,8 @@
 
 #please make generic modifications to unxgcc.mk or linux.mk
 gb_COMPILERDEFAULTOPTFLAGS := -O2
-gb_CXXFLAGS += -fsigned-char -fno-omit-frame-pointer
-gb_CFLAGS += -fsigned-char -fno-omit-frame-pointer
+gb_CXXFLAGS += -fno-omit-frame-pointer
+gb_CFLAGS += -fno-omit-frame-pointer
 
 include $(GBUILDDIR)/platform/linux.mk
 
diff --git a/solenv/inc/unxlngs390.mk b/solenv/inc/unxlngs390.mk
index 0eac39a..af2518f 100644
--- a/solenv/inc/unxlngs390.mk
+++ b/solenv/inc/unxlngs390.mk
@@ -30,6 +30,4 @@
 PICSWITCH:=-fPIC
 .INCLUDE : unxlng.mk
 CDEFS+=-DS390
-CFLAGS+=-fsigned-char -fno-omit-frame-pointer
-CFLAGSCC+=-fsigned-char
-CFLAGSCXX+=-fsigned-char
+CFLAGS+=-fno-omit-frame-pointer