--- a/Makefile	2021-08-17 00:18:48.000000000 +0530
+++ b/Makefile	2023-04-14 23:02:47.795861027 +0530
@@ -141,7 +141,7 @@
 #GIT_VERSION = $(shell command -v git 2>&1 > /dev/null && git describe --long --tags --dirty --always --abbrev=10 || cat VERSION)
 
 # Convert BITS=?? to a -m flag
-BITS=32
+BITS=
 ifeq (x86_64,$(shell uname -m))
 BITS=64
 endif
@@ -160,15 +160,15 @@
 ifeq (64,$(BITS))
 	BITS_FLAG = -m64
 endif
-SSE_FLAG=-msse2
+SSE_FLAG=
 
 DEBUG_FLAGS    = -O0 -g3 $(BIToS_FLAG) $(SSE_FLAG) -std=c++11
 DEBUG_DEFS     = -DCOMPILER_OPTIONS="\"$(DEBUG_FLAGS) $(EXTRA_FLAGS)\""
-RELEASE_FLAGS  = -O3 $(BITS_FLAG) $(SSE_FLAG) -funroll-loops -g3 -std=c++11
+RELEASE_FLAGS  = -O2 $(BITS_FLAG) $(SSE_FLAG) -funroll-loops -g3 -std=c++11
 RELEASE_DEFS   = -DCOMPILER_OPTIONS="\"$(RELEASE_FLAGS) $(EXTRA_FLAGS)\""
 NOASSERT_FLAGS = -DNDEBUG
 FILE_FLAGS     = -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
-CFLAGS         = 
+#CFLAGS         = 
 #CFLAGS         = -fdiagnostics-color=always
 
 ifeq (1,$(USE_SRA))
@@ -255,7 +255,8 @@
 	 $(CFLAGS) \
      $(PREF_DEF) \
      $(MM_DEF) \
-     $(SHMEM_DEF)
+     $(SHMEM_DEF) \
+	 $(LDFLAGS)
 
 #
 # centrifuge targets
@@ -363,11 +364,11 @@
 
 centrifuge-build.bat:
 	echo "@echo off" > centrifuge-build.bat
-	echo "python %~dp0/centrifuge-build %*" >> centrifuge-build.bat
+	echo "python3 %~dp0/centrifuge-build %*" >> centrifuge-build.bat
 
 centrifuge-inspect.bat:
 	echo "@echo off" > centrifuge-inspect.bat
-	echo "python %~dp0/centrifuge-inspect %*" >> centrifuge-inspect.bat
+	echo "python3 %~dp0/centrifuge-build %*" >> centrifuge-inspect.bat
 
 
 .PHONY: centrifuge-src
@@ -409,24 +410,24 @@
 MANUAL: MANUAL.markdown
 	perl doc/strip_markdown.pl < $^ > $@
 
-prefix=/usr/local
+prefix=/usr/
 
 .PHONY: install
 install: all
-	mkdir -p $(prefix)/bin
-	mkdir -p $(prefix)/share/centrifuge/indices
-	install -m 0644 indices/Makefile $(prefix)/share/centrifuge/indices
-	install -d -m 0755 $(prefix)/share/centrifuge/doc
-	install -m 0644 doc/* $(prefix)/share/centrifuge/doc
+	mkdir -p $(DESTDIR)$(prefix)/bin
+	mkdir -p $(DESTDIR)$(prefix)/share/centrifuge/indices
+	install -m 0644 indices/Makefile $(DESTDIR)$(prefix)/share/centrifuge/indices
+	install -d -m 0755 $(DESTDIR)$(prefix)/share/doc/centrifuge
+	install -m 0644 doc/* $(DESTDIR)$(prefix)/share/doc/centrifuge
 	for file in $(CENTRIFUGE_BIN_LIST) $(CENTRIFUGE_SCRIPT_LIST); do \
-		install -m 0755 $$file $(prefix)/bin ; \
+		install -m 0755 $$file $(DESTDIR)$(prefix)/bin ; \
 	done
 
 .PHONY: uninstall
 uninstall: all
 	for file in $(CENTRIFUGE_BIN_LIST) $(CENTRIFUGE_SCRIPT_LIST); do \
-		rm -v $(prefix)/bin/$$file ; \
-		rm -v $(prefix)/share/centrifuge; \
+		rm -v $(DESTDIR)$(prefix)/bin/$$file ; \
+		rm -v $(DESTDIR)$(prefix)/share/centrifuge; \
 	done