Problem detecting pthread in several packages... (cannot find -lpthread)

In several packeges I saw problem detecting pthread by configurator, like 
libdv-1.0.0:

configure:20722: checking for pthread_create in -lpthread
configure:20757: gcc -o conftest.exe -DPTW32_STATIC_LIB -Wall -g  -I/home/
Eugene/include  -L/home/Eugene/lib conftest.c -lpthread   >&5
c:\MinGW\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\mingw32\bin\ld.exe: cannot 
find -lpthread
collect2: ld returned 1 exit status
configure:20763: $? = 1
configure: failed program was:
| /* confdefs.h.  */
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE "libdv"
| #define VERSION "1.0.0"
| #define _GNU_SOURCE 1
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define DEBUG 1
| /* end confdefs.h.  */ 

Plese, help to solve this problem. By the way I have an old processor (K6-II+) 
without multithread support - may be this is the answer to this problem?
Thanks.