diff -ru a/CPP/7zip/7zip_gcc.mak b/CPP/7zip/7zip_gcc.mak
--- a/CPP/7zip/7zip_gcc.mak	2021-07-16 08:23:49.524088300 -0400
+++ b/CPP/7zip/7zip_gcc.mak	2021-08-14 14:43:34.618587556 -0400
@@ -13,13 +13,13 @@
 
 
 ifneq ($(CC), xlc)
-CFLAGS_WARN_WALL = -Wall -Werror -Wextra
+CFLAGS_WARN_WALL = -Wall -Wextra -Wno-misleading-indentation
 endif
 
 # for object file
 CFLAGS_BASE_LIST = -c
 # CFLAGS_BASE_LIST = -S
-CFLAGS_BASE = -O2 $(CFLAGS_BASE_LIST) $(CFLAGS_WARN_WALL) $(CFLAGS_WARN) \
+CFLAGS_BASE = $(CFLAGS_BASE_LIST) $(CFLAGS_WARN_WALL) $(CFLAGS_WARN) \
  -DNDEBUG -D_REENTRANT -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
  -fPIC
 
@@ -62,17 +62,17 @@
 
 ifdef IS_MINGW
 SHARED_EXT=.dll
-LDFLAGS = -shared -DEF $(DEF_FILE) $(LDFLAGS_STATIC)
+MY_LDFLAGS = -shared -DEF $(DEF_FILE) $(LDFLAGS_STATIC)
 else
 SHARED_EXT=.so
-LDFLAGS = -shared -fPIC $(LDFLAGS_STATIC)
+MY_LDFLAGS = -shared -fPIC $(LDFLAGS_STATIC)
 CC_SHARED=-fPIC
 endif
 
 
 else
 
-LDFLAGS = $(LDFLAGS_STATIC)
+MY_LDFLAGS = $(LDFLAGS_STATIC)
 # -s is not required for clang, do we need it for GGC ???
 # -s
 
@@ -156,7 +156,7 @@
 	$(MY_MKDIR) $(O)
 
 $(PROGPATH): $(OBJS)
-	$(CXX) -o $(PROGPATH) -s $(MY_ARCH_2) $(LDFLAGS) $(LD_arch) $(OBJS) $(MY_LIBS) $(LIB2)
+	$(CXX) -o $(PROGPATH) $(MY_ARCH_2) $(LDFLAGS) $(MY_LDFLAGS) $(LD_arch) $(OBJS) $(MY_LIBS) $(LIB2)
 
 #	-s strips debug sections from executable in GCC