diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e9483f8..369a5c2f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -166,11 +166,9 @@ else()
 	check_include_files(dl.h HAVE_DL_H)
 	check_include_files(errno.h HAVE_ERRNO_H)
 	check_include_files(fcntl.h HAVE_FCNTL_H)
-	check_function_exists(finite HAVE_FINITE)
 	check_include_files(float.h HAVE_FLOAT_H)
 	check_function_exists(fpclass HAVE_FPCLASS)
 	check_function_exists(fprintf HAVE_FPRINTF)
-	check_function_exists(fp_class HAVE_FP_CLASS)
 	check_function_exists(ftime HAVE_FTIME)
 	check_function_exists(getaddrinfo HAVE_GETADDRINFO)
 	check_function_exists(gettimeofday HAVE_GETTIMEOFDAY)
@@ -178,9 +176,7 @@ else()
 	check_function_exists(isascii HAVE_ISASCII)
 	check_function_exists(isinf HAVE_ISINF)
 	check_function_exists(isnan HAVE_ISNAN)
-	check_function_exists(isnand HAVE_ISNAND)
 	check_library_exists(history append_history "" HAVE_LIBHISTORY)
-	check_library_exists(lzma lzma_code "" HAVE_LIBLZMA)
 	check_library_exists(pthread pthread_join "" HAVE_LIBPTHREAD)
 	check_library_exists(readline readline "" HAVE_LIBREADLINE)
 	check_library_exists(z gzread "" HAVE_LIBZ)