+dnl Use mmap in rrd_update instead of seek+write
+AC_ARG_ENABLE([mmap],
+[ --disable-mmap disable mmap in rrd_update, use seek+write instead],
+[],
+[enable_mmap=yes])
+
+dnl will most likely not work on compressed filesystems, i think.. *shrug*
+AC_ARG_ENABLE([direct-io],
+[ --enable-direct-io enable O_DIRECT if available],
+[enable_direct_io=yes],
+[])
+
+AC_ARG_ENABLE(pthread,[ --disable-pthread disable multithread support],
+[],[enable_pthread=yes])
+
+AC_ARG_ENABLE(static-programs,
+ [ --enable-static-programs Build static programs],
+ [case "${enableval}" in
+ yes) staticprogs=yes ;;
+ no) staticprogs=no ;;
+ *) AC_MSG_ERROR(bad value ${enableval} for --enable-static-programs) ;;
+ esac],[staticprogs=no])
+AM_CONDITIONAL(STATIC_PROGRAMS,[test "x$staticprogs" = "xyes"])
+
+
+CONFIGURE_PART(Audit Compilation Environment)
+
+
+dnl Check for the compiler and static/shared library creation.
+AC_PROG_CC
+AC_PROG_CPP
+AC_PROG_LIBTOOL
+
+dnl Try to detect/use GNU features
+CFLAGS="$CFLAGS -D_GNU_SOURCE"
+
+dnl which flags does the compiler support?
+if test "x$GCC" = "xyes"; then
+ for flag in -fno-strict-aliasing -Wall -std=c99 -pedantic -Wundef -Wshadow -Wpointer-arith -Wcast-align -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Winline -W; do
+ oCFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $flag"
+ cachename=rd_cv_gcc_flag_`echo $flag|sed 's/[[^A-Za-z]]/_/g'`
+ AC_CACHE_CHECK([if gcc likes the $flag flag], $cachename,
+ [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[return 0 ]])],[eval $cachename=yes],[eval $cachename=no])])
+ if eval test \$$cachename = no; then
+ CFLAGS="$oCFLAGS"
+ fi
+ done
+fi
+
+
+