diff --git a/GNUmakef.def b/GNUmakef.def
index 6990f26..be3a317 100644
--- a/GNUmakef.def
+++ b/GNUmakef.def
@@ -42,7 +42,6 @@ WINDRES=windres
 EXEEXT=.exe
 OBJEXT=.o
 LIBEXT=.a
-CFLAGS+=-funsigned-char
 else
 ifeq ($(PLATFORM),emx)
 CAT=cat
@@ -64,7 +63,6 @@ LIBEXT=.a
 #OBJEXT=.obj
 #LIBEXT=.lib
 CXX=$(CC)
-CFLAGS+=-funsigned-char
 else
 ifeq ($(PLATFORM),djg)
 CAT=command.com /c type
@@ -78,7 +76,6 @@ SHELL=sh
 EXEEXT=.exe
 OBJEXT=.o
 LIBEXT=.a
-CFLAGS+=-funsigned-char
 else
 ifeq ($(PLATFORM),be)
 CAT=cat
@@ -91,7 +88,6 @@ RANLIB=ranlib
 EXEEXT=
 OBJEXT=.o
 LIBEXT=.a
-CFLAGS+=-funsigned-char
 LNKFLAGS+=-lbe -ltextencoding
 else
 ifeq ($(PLATFORM),sun) # SUN Solaris
@@ -105,7 +101,7 @@ RANLIB=ranlib
 EXEEXT=
 OBJEXT=.o
 LIBEXT=.a
-CFLAGS+=-fsigned-char -D__SUNOS__ -D__UNIX__ -DUNIX
+CFLAGS+=-D__SUNOS__ -D__UNIX__ -DUNIX
 else                   # Linux, *BSD or another unix-like OS
 CAT=cat
 SED=sed
@@ -118,13 +114,12 @@ PLATFORM=lnx
 EXEEXT=
 OBJEXT=.o
 LIBEXT=.a
-CFLAGS+=-funsigned-char
 endif
 endif
 endif
 endif
 endif
-CFLAGS+=-g $(INCS) -Wall -Wno-sign-compare -pedantic -O2 -DPRAGMA_PACK # -fomit-frame-pointer
+CFLAGS+=-funsigned-char -g $(INCS) -Wall -Wno-sign-compare -pedantic -O2 -DPRAGMA_PACK # -fomit-frame-pointer
 LNKFLAGS+=-g
 CPPFLAGS+=$(CFLAGS) -fno-rtti # -fno-exceptions
 
diff --git a/goldlib/gall/gdefs.h b/goldlib/gall/gdefs.h
index 6cc89bf..4778df3 100644
--- a/goldlib/gall/gdefs.h
+++ b/goldlib/gall/gdefs.h
@@ -144,7 +144,9 @@ typedef unsigned short uint16_t;
 typedef unsigned int   uint32_t;
 
 #if !defined(__APPLE__)
+#if !defined(__SUNOS__)
 typedef   signed char   int8_t;
+#endif
 typedef   signed short  int16_t;
 typedef   signed int    int32_t;
 #endif
diff --git a/goldlib/gall/gfile.h b/goldlib/gall/gfile.h
index d39c0c2..bc82df2 100644
--- a/goldlib/gall/gfile.h
+++ b/goldlib/gall/gfile.h
@@ -161,7 +161,9 @@ public:
   #endif
 
   gfile& operator>> (char& i)     { return operator>>((uint8_t&)i); }
+#if !defined(__SUNOS__)
   gfile& operator>> (int8_t& i)   { return operator>>((uint8_t&)i); }
+#endif
   gfile& operator>> (int16_t& i)  { return operator>>((uint16_t&)i); }
   gfile& operator>> (int32_t& i)  { return operator>>((uint32_t&)i); }
   #if !defined(__CYGWIN__)
@@ -179,7 +181,9 @@ public:
   #endif
 
   gfile& operator<< (char o)      { return operator<<((uint8_t )o); }
+#if !defined(__SUNOS__)
   gfile& operator<< (int8_t  o)   { return operator<<((uint8_t )o); }
+#endif
   gfile& operator<< (int16_t  o)  { return operator<<((uint16_t)o); }
   gfile& operator<< (int32_t o)   { return operator<<((uint32_t)o); }
   #if !defined(__CYGWIN__)