Build flags and not using internal lapack headers.

diff --git a/build/linux/Makefile.linux b/build/linux/Makefile.linux
index 5f2b331..a60a4ee 100644
--- a/build/linux/Makefile.linux
+++ b/build/linux/Makefile.linux
@@ -1,6 +1,7 @@
 
-CFLAGS := -DNDEBUG -O3 -fno-exceptions -fPIC -ffast-math -msse -mfpmath=sse -ftree-vectorize -fomit-frame-pointer -DUSE_PTHREADS -I./include
+CFLAGS := -DNDEBUG -fno-exceptions -fPIC -ffast-math -ftree-vectorize -fomit-frame-pointer -DUSE_PTHREADS $(CFLAGS)
 CXXFLAGS := $(CFLAGS)
+LDFLAGS := $(LDFLAGS)
 
 include build/general/Makefile.inc
 
diff --git a/build/linux/Makefile.linux64 b/build/linux/Makefile.linux64
deleted file mode 100644
index b5460d4..0000000
--- a/build/linux/Makefile.linux64
+++ /dev/null
@@ -1,6 +0,0 @@
-
-CFLAGS := -DNDEBUG -O3 -fno-exceptions -fPIC -ffast-math -msse -mfpmath=sse -ftree-vectorize -fomit-frame-pointer -DUSE_PTHREADS -Ibuild/linux/amd64
-CXXFLAGS := $(CFLAGS)
-
-include build/general/Makefile.inc
-