--- zstd-1.3.4/programs/Makefile.orig	2018-03-26 22:19:34.000000000 +0000
+++ zstd-1.3.4/programs/Makefile	2018-04-30 14:55:39.468000000 +0000
@@ -38,7 +38,6 @@
 CPPFLAGS+= -I$(ZSTDDIR) -I$(ZSTDDIR)/common -I$(ZSTDDIR)/compress \
            -I$(ZSTDDIR)/dictBuilder \
            -DXXH_NAMESPACE=ZSTD_
-CFLAGS  ?= -O3
 DEBUGFLAGS+=-Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \
             -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement \
             -Wstrict-prototypes -Wundef -Wpointer-arith -Wformat-security \