Updated configure.ac with requirements

configure.ac

@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.67])
-AC_INIT([cputool], [0.0.3], [nkukard@lbsd.net])
+AC_INIT([cputool], [@VERSION@], [nkukard@lbsd.net])
 AM_INIT_AUTOMAKE
 
 AC_CONFIG_SRCDIR([cputool.h])
@@ -14,9 +14,10 @@ AC_PROG_CC_STDC
 AC_GNU_SOURCE
 
 # Checks for libraries.
+AC_CHECK_LIB([rt], [fabs])
 
 # Checks for header files.
-AC_CHECK_HEADERS([fcntl.h stdint.h stdlib.h string.h sys/time.h unistd.h])
+AC_CHECK_HEADERS([fcntl.h stdint.h stdlib.h string.h unistd.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_INLINE
@@ -24,10 +25,10 @@ AC_TYPE_PID_T
 AC_TYPE_SSIZE_T
 AC_TYPE_UINT32_T
 AC_TYPE_UINT64_T
-AC_TYPE_UINT8_T
 
 # Checks for library functions.
 AC_FUNC_FORK
+AC_FUNC_MALLOC
 AC_FUNC_STRTOD
 AC_CHECK_FUNCS([clock_gettime strerror])