[PLUG] Unable to compile programs

[Deepak Dinesh]

Hi,
	I have been unable to compile programs I download on my Redhat 6.2
system. (I am able to compile helloworld programs). The configure script
has problems finding headers. For eg.
This is a configure script output for the program
curl(http://curl.haxx.se):
I ran it as ./configure:

loading cache ./config.cache
checking for a BSD compatible install... (cached) /usr/bin/install -c
checking whether build environment is sane... yes
checking whether make sets ${MAKE}... (cached) yes
checking for working aclocal... found
checking for working autoconf... found
checking for working automake... found
checking for working autoheader... found
checking for working makeinfo... found
checking host system type... i586-pc-linux-gnu
checking build system type... i586-pc-linux-gnu
checking for ranlib... (cached) ranlib
checking for gcc... (cached) gcc
checking whether the C compiler (gcc  ) works... yes
checking whether the C compiler (gcc  ) is a cross-compiler... no
checking whether we are using GNU C... (cached) yes
checking whether gcc accepts -g... (cached) yes
checking for ld used by GCC... (cached) /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... (cached) yes
checking for BSD-compatible nm... (cached) /usr/bin/nm -B
checking whether ln -s works... (cached) yes
loading cache ./config.cache within ltconfig
checking for object suffix... o
checking for executable suffix... (cached) no
checking for gcc option to produce PIC... -fPIC
checking if gcc PIC flag -fPIC works... yes
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.lo... yes
checking if gcc supports -fno-rtti -fno-exceptions ... yes
checking if gcc static flag -static works... -static
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking whether the linker (/usr/bin/ld) supports shared libraries... yes
checking command to parse /usr/bin/nm -B output... ok
checking how to hardcode library paths into programs... immediate
checking for /usr/bin/ld option to reload object files... -r
checking dynamic linker characteristics... Linux ld.so
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for objdir... .libs
creating libtool
loading cache ./config.cache
checking host system type... i586-pc-linux-gnu
checking target system type... i586-pc-linux-gnu
checking for gcc... (cached) gcc
checking whether the C compiler (gcc -g -O2 ) works... yes
checking whether the C compiler (gcc -g -O2 ) is a cross-compiler... no
checking whether we are using GNU C... (cached) yes
checking whether gcc accepts -g... (cached) yes
checking whether make sets ${MAKE}... (cached) yes
checking how to run the C preprocessor... (cached) gcc -E
checking for AIX... no
checking for gethostbyname... (cached) yes
checking for strcasecmp... (cached) yes
checking for connect... (cached) yes
checking for gethostname... (cached) yes
checking for dlopen... (cached) no
checking for dlopen in -ldl... (cached) yes
checking where to look for SSL... defaults (or given in environment)
checking for CRYPTO_lock in -lcrypto... (cached) yes
checking for SSL_connect in -lssl... (cached) yes
checking for openssl/x509.h... (cached) yes
checking for openssl/rsa.h... (cached) yes
checking for openssl/crypto.h... (cached) yes
checking for openssl/pem.h... (cached) yes
checking for openssl/ssl.h... (cached) yes
checking for openssl/err.h... (cached) no
checking for ANSI C header files... (cached) yes
checking for unistd.h... (cached) yes
checking for malloc.h... (cached) yes
checking for stdlib.h... (cached) yes
checking for arpa/inet.h... (cached) no
checking for net/if.h... (cached) no
checking for netinet/in.h... (cached) no
checking for netdb.h... (cached) no
checking for sys/select.h... (cached) yes
checking for sys/socket.h... (cached) no
checking for sys/sockio.h... (cached) no
checking for sys/stat.h... (cached) yes
checking for sys/types.h... (cached) yes
checking for sys/time.h... (cached) yes
checking for getopt.h... (cached) yes
checking for sys/param.h... (cached) no
checking for termios.h... (cached) yes
checking for termio.h... (cached) no
checking for sgtty.h... (cached) no
checking for fcntl.h... (cached) yes
checking for dlfcn.h... (cached) yes
checking for alloca.h... (cached) yes
checking for winsock.h... (cached) no
checking for time.h... (cached) yes
checking for io.h... (cached) no
checking for working const... (cached) yes
checking for size_t... (cached) yes
checking whether time.h and sys/time.h may both be included... (cached) yes
checking size of long double... (cached) 12
checking size of long long... (cached) 8
checking host system type... i586-pc-linux-gnu
checking return type of signal handlers... (cached) int
checking for vprintf... (cached) yes
checking for socket... (cached) yes
checking for select... (cached) yes
checking for strdup... (cached) yes
checking for strstr... (cached) yes
checking for strftime... (cached) yes
checking for uname... (cached) yes
checking for strcasecmp... (cached) yes
checking for stricmp... (cached) no
checking for strcmpi... (cached) no
checking for gethostname... (cached) yes
checking for gethostbyname_r... (cached) yes
checking for gethostbyaddr... (cached) yes
checking for gethostbyaddr_r... (cached) yes
checking for localtime_r... (cached) yes
checking for getservbyname... (cached) yes
checking for gettimeofday... (cached) yes
checking for inet_addr... (cached) yes
checking for inet_ntoa... (cached) yes
checking for inet_ntoa_r... (cached) no
checking for tcsetattr... (cached) yes
checking for tcgetattr... (cached) yes
checking for perror... (cached) yes
checking for getpass... (cached) yes
checking for closesocket... (cached) no
checking for setvbuf... (cached) yes
checking for RAND_status... (cached) yes
checking for RAND_screen... (cached) no
checking number of arguments of gethostbyname_r... (cached) 0
checking number of arguments of gethostbyaddr_r... (cached) 0
checking for perl... (cached) /usr/bin/perl
checking for gnroff... (cached) /usr/bin/gnroff
checking for bison... (cached) bison -y
creating ./config.status
creating Makefile
creating curl.spec
creating curl-ssl.spec
creating docs/Makefile
creating include/Makefile
creating include/curl/Makefile
creating src/Makefile
creating lib/Makefile
creating config.h
config.h is unchanged
creating src/config.h
src/config.h is unchanged

	In the above output,  for eg., arpa/inet.h exists, but configure
can't find it.
	What changes should I make so that I can get the programs to see
the header files ?
Thanks.