--- a/Makefile
+++ b/Makefile
@@ -57,16 +57,16 @@
 	$(MAKE) --no-print-directory -C $(SOURCE_PATH) -f $(MAKEFILE) test
 
 install_common_		:
-	$(MKDIR) -p $(PREFIX)/bin
-	$(INSTALL) $(VAR_PATH)/yaskkserv_make_dictionary/yaskkserv_make_dictionary $(PREFIX)/bin/yaskkserv_make_dictionary
+	$(MKDIR) -p $(DESTDIR)$(PREFIX)/bin
+	$(INSTALL) $(VAR_PATH)/yaskkserv_make_dictionary/yaskkserv_make_dictionary $(DESTDIR)$(PREFIX)/bin/yaskkserv_make_dictionary
 
 install			: install_normal
 
 install_all		: install_common_
-	$(MKDIR) -p $(PREFIX)/sbin
-	$(INSTALL) $(VAR_PATH)/yaskkserv_simple/yaskkserv_simple $(PREFIX)/sbin/yaskkserv_simple
-	$(INSTALL) $(VAR_PATH)/yaskkserv_normal/yaskkserv_normal $(PREFIX)/sbin/yaskkserv_normal
-	$(INSTALL) $(VAR_PATH)/yaskkserv_hairy/yaskkserv_hairy $(PREFIX)/sbin/yaskkserv_hairy
+	$(MKDIR) -p $(DESTDIR)$(PREFIX)/sbin
+	$(INSTALL) $(VAR_PATH)/yaskkserv_simple/yaskkserv_simple $(DESTDIR)$(PREFIX)/sbin/yaskkserv_simple
+	$(INSTALL) $(VAR_PATH)/yaskkserv_normal/yaskkserv_normal $(DESTDIR)$(PREFIX)/sbin/yaskkserv_normal
+	$(INSTALL) $(VAR_PATH)/yaskkserv_hairy/yaskkserv_hairy $(DESTDIR)$(PREFIX)/sbin/yaskkserv_hairy
 
 install_simple		: install_common_
 	$(MKDIR) -p $(PREFIX)/sbin
--- a/source/Makefile.bsd_cygwin_linux_gcc.common
+++ b/source/Makefile.bsd_cygwin_linux_gcc.common
@@ -16,16 +16,16 @@
 endif				# DEBUG
 
 INCLUDE_FLAGS		= -I . -I $(VAR_PATH) -I $(PROJECT_ROOT)/source/skk -I $(PROJECT_ROOT)/source/skk/architecture -I $(PROJECT_ROOT)/source/skk/architecture/$(ARCHITECTURE_LOWER_CASE)
-LIBRARY_FLAGS		= -L/usr/lib
+LIBRARY_FLAGS		=
 
-CPPFLAGS		= $(DEBUG_FLAGS) $(CXXFLAGS_ARCHITECTURE) $(CXXFLAGS_BYTE_ORDER) $(CXXFLAGS_CONFIG) $(INCLUDE_FLAGS) $(CXXFLAGS_DEFINE) -D $(PROJECT_IDENTIFIER)_VERSION=\"$(PROJECT_VERSION)\"
+CPPFLAGS		+= $(DEBUG_FLAGS) $(CXXFLAGS_ARCHITECTURE) $(CXXFLAGS_BYTE_ORDER) $(CXXFLAGS_CONFIG) $(INCLUDE_FLAGS) $(CXXFLAGS_DEFINE) -D $(PROJECT_IDENTIFIER)_VERSION=\"$(PROJECT_VERSION)\"
 
-CXXFLAGS		= $(DEBUG_FLAGS) $(CXXFLAGS_ARCHITECTURE) $(CXXFLAGS_BYTE_ORDER) $(CXXFLAGS_CONFIG) $(INCLUDE_FLAGS) $(OPTIMIZE_FLAGS) $(CXXFLAGS_WARNING) -fno-exceptions -fno-rtti -fmessage-length=0 -pipe -fPIC -D $(PROJECT_IDENTIFIER)_VERSION=\"$(PROJECT_VERSION)\"
+CXXFLAGS		+= $(DEBUG_FLAGS) $(CXXFLAGS_ARCHITECTURE) $(CXXFLAGS_BYTE_ORDER) $(CXXFLAGS_CONFIG) $(INCLUDE_FLAGS) $(OPTIMIZE_FLAGS) $(CXXFLAGS_WARNING) -fno-exceptions -fno-rtti -fmessage-length=0 -pipe -fPIC -D $(PROJECT_IDENTIFIER)_VERSION=\"$(PROJECT_VERSION)\"
 
-LDFLAGS			= $(DEBUG_FLAGS) $(LDFLAGS_ARCHITECTURE) $(OPTIMIZE_FLAGS) -pipe $(LIBRARY_FLAGS) -fPIC
+LDFLAGS			+= $(DEBUG_FLAGS) $(LDFLAGS_ARCHITECTURE) $(OPTIMIZE_FLAGS) -pipe $(LIBRARY_FLAGS) -fPIC
 
 CXX			= $(CCACHE) $(COMPILER)
 LD			= $(COMPILER)
 CPP			= $(CXX)
 LD			= $(CXX)
-STRIP			= strip
+STRIP			= true
--- a/source/yaskkserv_hairy/Makefile.bsd_cygwin_linux_gcc
+++ b/source/yaskkserv_hairy/Makefile.bsd_cygwin_linux_gcc
@@ -12,7 +12,7 @@
 # RUN_FLAGS		= --port=9999 --google-japanese-input=dictionary --google-suggest --google-japanese-input-timeout=1.1 https://www.google.com
 # RUN_FLAGS		= --port=9999 --google-japanese-input=dictionary --google-japanese-input-timeout=1.1 http://www.google.com /home/wac/local/share/skk/SKK-JISYO.total+zipcode.yaskkserv
 # RUN_FLAGS		= --port=9999 --google-japanese-input=dictionary --google-japanese-input-timeout=1.1 http://www.google.com
-CXXFLAGS		+= $(CXXFLAGS_OPTIMIZE_SERVER_HAIRY) $(CXXFLAGS_WARNING_SERVER_HAIRY)
+CXXFLAGS		+= $(CXXFLAGS_WARNING_SERVER_HAIRY)
 
 SOURCES			= ${wildcard *.cpp}
 OBJECTS			= ${addprefix $(VAR_PATH)/$(TARGET_BASE)/,$(SOURCES:.cpp=.o)}
--- a/source/yaskkserv_make_dictionary/Makefile.bsd_cygwin_linux_gcc
+++ b/source/yaskkserv_make_dictionary/Makefile.bsd_cygwin_linux_gcc
@@ -5,7 +5,7 @@
 TARGET_BASE		= yaskkserv_make_dictionary
 
 RUN_FLAGS		=
-CXXFLAGS		+= $(CXXFLAGS_OPTIMIZE_TOOL) $(CXXFLAGS_WARNING_TOOL)
+CXXFLAGS		+= $(CXXFLAGS_WARNING_TOOL)
 
 SOURCES			= ${wildcard *.cpp}
 OBJECTS			= ${addprefix $(VAR_PATH)/$(TARGET_BASE)/,$(SOURCES:.cpp=.o)}
--- a/source/yaskkserv_normal/Makefile.bsd_cygwin_linux_gcc
+++ b/source/yaskkserv_normal/Makefile.bsd_cygwin_linux_gcc
@@ -5,7 +5,7 @@
 TARGET_BASE		= yaskkserv_normal
 
 RUN_FLAGS		= --check-update --port=9999 /var/tmp/SKK-JISYO.total+zipcode.yaskkserv
-CXXFLAGS		+= $(CXXFLAGS_OPTIMIZE_SERVER_NORMAL) $(CXXFLAGS_WARNING_SERVER_NORMAL)
+CXXFLAGS		+= $(CXXFLAGS_WARNING_SERVER_NORMAL)
 
 SOURCES			= ${wildcard *.cpp}
 OBJECTS			= ${addprefix $(VAR_PATH)/$(TARGET_BASE)/,$(SOURCES:.cpp=.o)}
--- a/source/yaskkserv_simple/Makefile.bsd_cygwin_linux_gcc
+++ b/source/yaskkserv_simple/Makefile.bsd_cygwin_linux_gcc
@@ -5,7 +5,7 @@
 TARGET_BASE		= yaskkserv_simple
 
 RUN_FLAGS		= --port=9999 /var/tmp/SKK-JISYO.total+zipcode.yaskkserv
-CXXFLAGS		+= $(CXXFLAGS_OPTIMIZE_SERVER_SIMPLE) $(CXXFLAGS_WARNING_SERVER_SIMPLE)
+CXXFLAGS		+= $(CXXFLAGS_WARNING_SERVER_SIMPLE)
 
 SOURCES			= ${wildcard *.cpp}
 OBJECTS			= ${addprefix $(VAR_PATH)/$(TARGET_BASE)/,$(SOURCES:.cpp=.o)}