configure problems on solaris x86 and What are LDFLAGS and CPPFLAGS?

[Dan Cox <dancox@teleport.com>]

When I try to:

./configure --enable-debug --enable-syslog --enable-slapd --enable-crypt 
--enable-spasswd --with-tls --with-syrus-sasl --enable-kpasswd 
--enable-wrappers --enable-slurpd --enable-sql --enable-passwd 
--enable-lbdm --enable-ldap --enable-dnssrv --enable-local --enable-cache.

I get this:

checking for sys/un.h... grep: conftest.out: No such file or directory
yes
checking for krb5.h... grep: conftest.out: No such file or directory
yes
checking for heim_err.h... grep: conftest.out: No such file or directory
yes
checking for main in -ldes... no
checking for main in -lkrb5... no
configure: error: Required Kerberos 5 support not available.

   I do have kerberos installed and found krb.h in many directories. 
Also the  "grep: conftest.out" shows up quite a bit during the 
./configure. If anybody can help me out I'd greatly appreciate it. Also 
can anybody tell me what LDFLAGS and CPPFLAGS are? Why are they 
important to set? Please use small words, everything I can find on the 
subject seems to be written for experienced programmers (something I am 
defiantly not). Some of the output from ./configure is below.

The output:

checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for shl_load... no
checking for shl_load in -ldld... no
checking for dlopen... yes
checking whether a program can dlopen itself... yes
checking whether a statically linked program can dlopen itself... no
checking whether -lc should be explicitly linked in... yes
creating libtool
checking for mawk... (cached) gawk
checking whether ln works... yes
checking whether ln -s works... (cached) yes
checking for sendmail... /usr/lib/sendmail
checking for vi... /usr/bin/vi
checking how to run the C preprocessor...  -E
checking for Cygwin environment... (cached) no
checking for mingw32 environment... (cached) no
checking for executable suffix... (cached) no
checking for object suffix... (cached) o
checking for be_app in -lbe... no
checking for gcc option to accept ANSI C... none needed
checking for gcc depend flag... -M
checking for afopen in -ls... no
checking for EBCDIC... grep: conftest.out: No such file or directory
yes
checking for ANSI C header files... grep: conftest.out: No such file or 
directory
no
configure: warning: could not locate Standard C compliant headers
checking for dirent.h that defines DIR... yes
checking for opendir in -ldir... no
checking for sys/wait.h that is POSIX.1 compatible... yes
checking POSIX termios... yes
checking whether use of TIOCGWINSZ requires sys/ioctl.h... no
checking for arpa/inet.h... grep: conftest.out: No such file or directory
yes
checking for arpa/nameser.h... grep: conftest.out: No such file or directory
yes
checking for assert.h... grep: conftest.out: No such file or directory
yes
checking for conio.h... grep: conftest.out: No such file or directory
yes
checking for crypt.h... grep: conftest.out: No such file or directory
yes
checking for direct.h... grep: conftest.out: No such file or directory
yes
checking for errno.h... grep: conftest.out: No such file or directory
yes
checking for fcntl.h... grep: conftest.out: No such file or directory
yes
checking for filio.h... grep: conftest.out: No such file or directory
yes
checking for getopt.h... grep: conftest.out: No such file or directory
yes
checking for grp.h... grep: conftest.out: No such file or directory
yes
checking for io.h... grep: conftest.out: No such file or directory
yes
checking for libutil.h... grep: conftest.out: No such file or directory
yes
checking for limits.h... grep: conftest.out: No such file or directory
yes
checking for locale.h... grep: conftest.out: No such file or directory
yes
checking for netinet/tcp.h... grep: conftest.out: No such file or directory
yes
checking for malloc.h... grep: conftest.out: No such file or directory
yes
checking for memory.h... grep: conftest.out: No such file or directory
yes
checking for psap.h... grep: conftest.out: No such file or directory
yes
checking for pwd.h... grep: conftest.out: No such file or directory
yes
checking for process.h... grep: conftest.out: No such file or directory
yes
checking for resolv.h... grep: conftest.out: No such file or directory
yes
checking for sgtty.h... grep: conftest.out: No such file or directory
yes
checking for shadow.h... grep: conftest.out: No such file or directory
yes
checking for stddef.h... grep: conftest.out: No such file or directory
yes
checking for string.h... grep: conftest.out: No such file or directory
yes
checking for strings.h... grep: conftest.out: No such file or directory
yes
checking for sysexits.h... grep: conftest.out: No such file or directory
yes
checking for sys/file.h... grep: conftest.out: No such file or directory
yes
checking for sys/filio.h... grep: conftest.out: No such file or directory
yes
checking for sys/errno.h... grep: conftest.out: No such file or directory
yes
checking for sys/ioctl.h... grep: conftest.out: No such file or directory
yes
checking for sys/param.h... grep: conftest.out: No such file or directory
yes
checking for sys/resource.h... grep: conftest.out: No such file or directory
yes
checking for sys/select.h... grep: conftest.out: No such file or directory
yes
checking for sys/socket.h... grep: conftest.out: No such file or directory
yes
checking for sys/syslog.h... grep: conftest.out: No such file or directory
yes
checking for sys/time.h... grep: conftest.out: No such file or directory
yes
checking for sys/types.h... grep: conftest.out: No such file or directory
yes
checking for syslog.h... grep: conftest.out: No such file or directory
yes
checking for termios.h... grep: conftest.out: No such file or directory
yes
checking for unistd.h... grep: conftest.out: No such file or directory
yes
checking for winsock.h... grep: conftest.out: No such file or directory
yes
checking for winsock2.h... grep: conftest.out: No such file or directory
yes
checking for dlopen... (cached) yes
checking for sigset in -lV3... no
checking for winsock... no
checking for socket... no
checking for main in -lsocket... yes
checking for main in -lnet... no
checking for main in -lnsl_s... no
checking for main in -lnsl... yes
checking for socket in -linet... no
checking for main in -lgen... yes
checking for select... yes
checking for regex.h... grep: conftest.out: No such file or directory
yes
checking for library containing regfree... none required
checking for compatible POSIX regex... yes
checking for sys/uuid.h... grep: conftest.out: No such file or directory
yes
checking for library containing uuid_to_str... no
checking to see if -lrpcrt4 is needed for win32 UUID support... no
checking for res_query... no
checking for __res_query... no
checking for res_query in -lbind... no
checking for __res_query in -lbind... no
checking for res_query in -lresolv... yes
checking for getaddrinfo... yes
checking for gai_strerror... yes
checking for inet_ntop... yes
checking INET6_ADDRSTRLEN... no
checking for sys/un.h... grep: conftest.out: No such file or directory
yes
checking for krb5.h... grep: conftest.out: No such file or directory
yes
checking for heim_err.h... grep: conftest.out: No such file or directory
yes
checking for main in -ldes... no
checking for main in -lkrb5... no
configure: error: Required Kerberos 5 support not available