diff --git a/conf/gkbuild.cmake b/conf/gkbuild.cmake
index 591ece4..c151fca 100644
--- a/conf/gkbuild.cmake
+++ b/conf/gkbuild.cmake
@@ -4,23 +4,17 @@ include(CheckIncludeFile)
 
 # Setup options.
 option(GDB "enable use of GDB" OFF)
-option(ASSERT "turn asserts on" OFF)
-option(ASSERT2 "additional assertions" OFF)
 option(DEBUG "add debugging support" OFF)
-option(GPROF "add gprof support" OFF)
 option(VALGRIND "add valgrind support" OFF)
 option(OPENMP "enable OpenMP support" OFF)
 option(PCRE "enable PCRE support" OFF)
-option(GKREGEX "enable GKREGEX support" OFF)
-option(GKRAND "enable GKRAND support" OFF)
+
 
 # Add compiler flags.
 if(MSVC)
   set(GK_COPTS "/Ox")
-  set(GK_COPTIONS "-DWIN32 -DMSC -D_CRT_SECURE_NO_DEPRECATE -DUSE_GKREGEX")
-elseif(MINGW)
-  set(GK_COPTS "-DUSE_GKREGEX")
-else()
+  set(GK_COPTIONS "-DWIN32 -DMSC -D_CRT_SECURE_NO_DEPRECATE")
+elseif(NOT MINGW)
   set(GK_COPTIONS "-DLINUX -D_FILE_OFFSET_BITS=64")
 endif(MSVC)
 if(CYGWIN)
@@ -72,56 +66,20 @@ 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 "${GK_COPTIONS} -DNDEBUG")
-endif(NOT ASSERT)
-
-if(NOT ASSERT2)
-  set(GK_COPTIONS "${GK_COPTIONS} -DNDEBUG2")
-endif(NOT ASSERT2)
-
 
 # Add various options
 if(PCRE)
   set(GK_COPTIONS "${GK_COPTIONS} -D__WITHPCRE__")
 endif(PCRE)
 
-if(GKREGEX)
-  set(GK_COPTIONS "${GK_COPTIONS} -DUSE_GKREGEX")
-endif(GKREGEX)
-
-if(GKRAND)
-  set(GK_COPTIONS "${GK_COPTIONS} -DUSE_GKRAND")
-endif(GKRAND)
-
-
-# Check for features.
-check_include_file(execinfo.h HAVE_EXECINFO_H)
-if(HAVE_EXECINFO_H)
-  set(GK_COPTIONS "${GK_COPTIONS} -DHAVE_EXECINFO_H")
-endif(HAVE_EXECINFO_H)
-
-check_function_exists(getline HAVE_GETLINE)
-if(HAVE_GETLINE)
-  set(GK_COPTIONS "${GK_COPTIONS} -DHAVE_GETLINE")
-endif(HAVE_GETLINE)
-
 
 # Custom check for TLS.
 if(MSVC)