File firebird-fix-unsigned-char.diff of Package firebird

Index: Firebird-2.5.2.26539-0/builds/posix/prefix.linux_generic
===================================================================
--- Firebird-2.5.2.26539-0.orig/builds/posix/prefix.linux_generic
+++ Firebird-2.5.2.26539-0/builds/posix/prefix.linux_generic
@@ -18,7 +18,7 @@
 #
 # 2 Oct 2002, Nickolay Samofatov - Major cleanup
 
-COMMON_FLAGS=-DLINUX -pipe -MMD -fPIC -DFB_SEND_FLAGS=MSG_NOSIGNAL
+COMMON_FLAGS=-DLINUX -pipe -MMD -fPIC -DFB_SEND_FLAGS=MSG_NOSIGNAL -fsigned-char
 
 PROD_FLAGS=-ggdb -O3 -DNDEBUG $(COMMON_FLAGS)
 DEV_FLAGS=-ggdb -p -Wall -Wno-switch $(COMMON_FLAGS)