Bugzilla Bug 239227

+++ This bug was initially created as a clone of Bug #66377 +++

well, summary says it all. Just check with the following simple test program:

#include <ical.h>

int main(void)
{
        struct icaltimetype x;
        icaltime_compare(x, x);
}

`gcc icaltest.c -lical` blows up with:
/usr/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../libical.so: undefined reference
to `pthread_getspecific'
/usr/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../libical.so: undefined reference
to `pthread_once'
/usr/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../libical.so: undefined reference
to `pthread_key_create'
/usr/lib/gcc/i686-pc-linux-gnu/3.4.2/../../../libical.so: undefined reference
to `pthread_setspecific'
collect2: ld returned 1 exit status

It doesn't happen when I build libical with LDFLAGS=-lpthread

As of 0.27 the bug re-emerged:

ld /usr/lib/libical.so
ld: warning: cannot find entry symbol _start; not setting start address
/usr/lib/libical.so: undefined reference to `pthread_key_create'
/usr/lib/libical.so: undefined reference to `pthread_once'
/usr/lib/libical.so: undefined reference to `pthread_getspecific'
/usr/lib/libical.so: undefined reference to `pthread_setspecific'

*** This bug has been marked as a duplicate of bug 66377 ***