diff --git a/conf/gkbuild.cmake b/conf/gkbuild.cmake
index 0e70a8e..d005f84 100644
--- a/conf/gkbuild.cmake
+++ b/conf/gkbuild.cmake
@@ -29,16 +29,7 @@ endif(CYGWIN)
 if(CMAKE_COMPILER_IS_GNUCC)
 # GCC opts.
   set(GK_COPTIONS "${GK_COPTIONS} -std=c99 -fno-strict-aliasing")
-if(VALGRIND)
-  set(GK_COPTIONS "${GK_COPTIONS} -march=x86-64 -mtune=generic")
-else()
-  set(GK_COPTIONS "${GK_COPTIONS} -march=native")
-endif(VALGRIND)
-  if(NOT MINGW)
-      set(GK_COPTIONS "${GK_COPTIONS} -fPIC")
-  endif(NOT MINGW)
-# GCC warnings.
-  set(GK_COPTIONS "${GK_COPTIONS} -Werror -Wall -pedantic -Wno-unused-function -Wno-unused-but-set-variable -Wno-unused-variable -Wno-unknown-pragmas -Wno-unused-label")
+
 elseif(${CMAKE_C_COMPILER_ID} MATCHES "Sun")
 # Sun insists on -xc99.
   set(GK_COPTIONS "${GK_COPTIONS} -xc99")
@@ -65,24 +56,10 @@ if(OPENMP)
 endif(OPENMP)
 
 
-# Add various definitions.
-if(GDB)
-  set(GK_COPTS "${GK_COPTS} -g")
-  set(GK_COPTIONS "${GK_COPTIONS} -Werror")
-else()
-  set(GK_COPTS "-O3")
-endif(GDB)
-
-
 if(DEBUG)
-  set(GK_COPTS "-Og")
   set(GK_COPTIONS "${GK_COPTIONS} -DDEBUG")
 endif(DEBUG)
 
-if(GPROF)
-  set(GK_COPTS "-pg")
-endif(GPROF)
-
 if(NOT ASSERT)
   set(GK_COPTIONS "${GK_COPTIONS} -DNDEBUG")
 endif(NOT ASSERT)
