Change lz4.rb like below:

 - not install static libraries
 - install libraries into /usr/local/lib64 on x86_64

packages/lz4.rb

@@ -3,19 +3,15 @@ require 'package'
 class Lz4 < Package
   description 'LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s per core (0.16 Bytes/cycle).'
   homepage 'http://lz4.github.io/lz4/'
-  version '1.7.5'
+  version '1.7.5-1'
   source_url 'https://github.com/lz4/lz4/archive/v1.7.5.tar.gz'
   source_sha256 '0190cacd63022ccb86f44fa5041dc6c3804407ad61550ca21c382827319e7e7e'
 
   def self.build
-    if `uname -m`.strip == "x86_64"
-      system "make", "PREFIX=/usr/local", "libdir=/usr/local/lib64"
-    else
-      system "make", "PREFIX=/usr/local", "libdir=/usr/local/lib"
-    end
+    system "make", "BUILD_STATIC=no"
   end
 
   def self.install
-    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+    system "make", "BUILD_STATIC=no", "DESTDIR=#{CREW_DEST_DIR}", "LIBDIR=#{CREW_LIB_PREFIX}", "install"
   end
 end