It seems that you can't compile simple C test for presence of rrd_create function from librrd, which is obligatory for extension.

So, I need more information, try to use phpize installation and attach the config.log

# wget http://pecl.php.net/get/rrd
# tar -xzf rrd-1.0.1.tgz
# cd rrd-1.0.1
# phpize
# ./configure
# make
# make install

Thank you for answer, here the "congig.log": http://depositfiles.com/files/ko65grjlo

Thanks, I found a problem:

FreeBSD doesn't have libdl, so I remove the -ldl flag from config.m4. Expect 1.0.2 soon.

part of config.log with a failed test

configure:6699: checking for rrd_create in -lrrd
configure:6724: cc -o conftest -g  -O0  -R/usr/local/lib -L/usr/local/lib  -ldl conftest.c -lrrd   >&5
/usr/bin/ld: cannot find -ldl
configure:6724: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| /* end confdefs.h.  */
| 
| /* Override any GCC internal prototype to avoid an error.
|    Use char because int might match the return type of a GCC
|    builtin and then its argument prototype would still apply.  */
| #ifdef __cplusplus
| extern "C"
| #endif
| char rrd_create ();
| int
| main ()
| {
| return rrd_create ();
|   ;
|   return 0;
| }
configure:6733: result: no

Thank you for your bug report. This issue has been fixed
in the latest released version of the package, which you can download at
http://pecl.php.net/get/rrd