$NetBSD$

# Respect env
--- Makefile.orig	2018-09-14 16:46:59.124139009 +0000
+++ Makefile
@@ -21,8 +21,8 @@
 # Makefile for bowtie, bowtie2-build, bowtie2-inspect
 #
 
-prefix := /usr/local
-bindir := $(prefix)/bin
+PREFIX ?= /usr/local
+bindir := $(PREFIX)/bin
 
 LDLIBS := -lz
 GCC_PREFIX := $(shell dirname `which gcc`)
@@ -187,7 +187,7 @@ endif
 SSE_FLAG := -msse2
 
 DEBUG_FLAGS    := -O0 -g3 -m64 $(SSE_FLAG)
-RELEASE_FLAGS  := -O3 -m64 $(SSE_FLAG) -funroll-loops -g3
+RELEASE_FLAGS  := $(CXXFLAGS)
 NOASSERT_FLAGS := -DNDEBUG
 FILE_FLAGS     := -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
 DEBUG_DEFS     = -DCOMPILER_OPTIONS="\"$(DEBUG_FLAGS) $(CXXFLAGS)\""
