+## check if our build system is complete
+AC_CHECK_HEADER(algorithm,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(ctype.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(dlfcn.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(errno.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(fcntl.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(functional,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(locale,,AC_DEFINE([SS_NO_LOCALE],[1],[Define to 1 to exclude locale support]))
+AC_CHECK_HEADER(map,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(netdb.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(poll.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(pthread.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(queue,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(semaphore.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(set,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(stdarg.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(stdint.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(stdio.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(stdlib.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(string,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(string.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(termios.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(unistd.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(vector,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(wchar.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(wctype.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(arpa/inet.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(netinet/in.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(netinet/tcp.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(sys/socket.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(sys/time.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_HEADER(sys/types.h,,AC_MSG_ERROR($msg_required_header_missing))
+AC_CHECK_FUNCS([close fcntl select write read shutdown send recv memset sprintf getaddrinfo getsockopt setsockopt connect poll sched_yield open strerror tcsetattr tcgetattr cfsetispeed cfsetospeed bind freeaddrinfo listen accept socket])
+
+## add the build date to LIB_INFO
+AC_CHECK_PROG(HAVE_GIT, git, yes)
+if test "x$HAVE_GIT" = "xyes"; then
+ revision=$(git --no-pager log --abbrev=7 -n 1 --pretty=format:"%h" HEAD)
+fi
+if test "x$revision" != "x"; then
+ LIB_INFO="$LIB_INFO, git revision: ${revision}"
+fi
+
+AC_CHECK_PROG(HAVE_DATE, date, yes)
+if test "x$HAVE_DATE" = "xyes"; then
+ LIB_INFO="$LIB_INFO, compiled on: `date -u`"
+else
+ LIB_INFO="$LIB_INFO, compiled on: (unknown date)"
+fi
+
+## add the name of the user who built libCEC to LIB_INFO
+AC_CHECK_PROG(HAVE_WHOAMI, whoami, yes)
+if test "x$HAVE_WHOAMI" = "xyes" ; then
+ LIB_INFO="$LIB_INFO by `whoami`"
+else
+ LIB_INFO="$LIB_INFO by (unknown user)"
+fi
+
+## add the hostname of the build host of libCEC to LIB_INFO
+AC_CHECK_PROG(HAVE_HOSTNAME, hostname, yes)
+if test "x$HAVE_HOSTNAME" = "xyes"; then
+ LIB_INFO="$LIB_INFO@`hostname -f`"
+fi
+
+## add the system info of the build host of libCEC to LIB_INFO
+AC_CHECK_PROG(HAVE_UNAME, uname, yes)
+if test "x$HAVE_UNAME" = "xyes"; then
+ LIB_INFO="$LIB_INFO on `uname -s` `uname -r` (`uname -m`)"
+fi
+
+## redefine the LIBS, so cec-client and cec-config aren't linked against things they don't need
+LIBS_LIBCEC="$LIBS"
+LIBS="$libs_client"
+
+CXXFLAGS="$CXXFLAGS -fPIC -Wall -Wextra -Wno-missing-field-initializers"
+
+if test "x$use_debug" = "xyes"; then
+ CXXFLAGS="$CXXFLAGS -g"
+fi
+
+if test "x$optimisation" = "xyes"; then
+ CXXFLAGS="$CXXFLAGS -O2"
+fi
+
+AC_DEFINE_UNQUOTED(LIB_INFO,"$LIB_INFO", "information about how libCEC was compiled")
+
+AC_SUBST([REQUIRES])
+AC_SUBST([LIBS])
+AC_SUBST([LIBS_LIBCEC])
+AC_SUBST([LIB_INFO])
+AC_SUBST([USE_P8_USB])
+AC_SUBST([USE_P8_USB_DETECT])
+AC_SUBST([USE_RPI_API])