diff -ur yoshimi-1.5.1/src/CMakeLists.txt yoshimi-1.5.1.new/src/CMakeLists.txt

--- yoshimi-1.5.1/src/CMakeLists.txt	2017-03-30 13:57:26.000000000 +0100

+++ yoshimi-1.5.1.new/src/CMakeLists.txt	2017-04-09 19:47:52.797194278 +0100

@@ -41,6 +41,7 @@

     # relative paths break some scripts(?)

 set (CMAKE_SKIP_RULE_DEPENDENCY OFF)

     # Rebuild objects if rules have changed, even if source hasn't.

+set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")

 message (STATUS "Building Yoshimi version ${YOSHIMI_VERSION} for ${CMAKE_SYSTEM_NAME}")

@@ -82,12 +83,12 @@

 option (ShowNoteOnTimes "Report Note-On Times" OFF)

 set (BuildOptions_x86_64AMD

-    "-O3 -march=athlon64 -m64 -Wall -ffast-math -fno-finite-math-only -fomit-frame-pointer"

+  ${CMAKE_C_FLAGS}

   CACHE STRING "X86_64 compiler options"

 )

 set (BuildOptions_X86_64Core2

-    "-O3 -march=core2 -m64 -Wall -ffast-math -fno-finite-math-only -fomit-frame-pointer"

+  ${CMAKE_C_FLAGS}

   CACHE STRING "X86_64 compiler options"

 )

@@ -102,7 +103,7 @@

 )

 set (BuildOptionsBasic

-    "-O3 -msse -msse2 -mfpmath=sse -ffast-math -fomit-frame-pointer"

+    ${CMAKE_C_FLAGS}

     CACHE STRING "basic X86 complier options"

 )