[h323plus] Compiling PTLib 2.10.1 in Ubuntu 11

[JF NP]

Hi,

I'm trying to build PTLib 2.10.1 in Ubuntu 11, and I have a problem with 
pthreads. When I run ./configure, I get the following output:


checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
.10figure: PTLib version is 2
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking target system type... i686-pc-linux-gnu
checking for swab... no
configure: OSTYPE set to linux
configure: OSRELEASE set to "2.6.38-8-generic"
configure: MACHTYPE set to x86
configure: gcc version is 4.5.2
checking checking if pragma implementation should be used... no
checking checking if precompiled headers available... no
checking how to run the C++ preprocessor... g++ -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... no
checking for sys/types.h... no
checking for sys/stat.h... no
checking for stdlib.h... no
checking for string.h... no
checking for memory.h... no
checking for strings.h... no
checking for inttypes.h... no
checking for stdint.h... no
checking for unistd.h... no
checking whether byte ordering is bigendian... yes
configure: Default extension for C++ files is cpp
checking if compiler accepts -felide-constructors... no
checking if linker accepts -Wreorder... no
checking if debug build accepts -g3 -ggdb -O0... no
checking if compiler uses RTTI by default... no
checking size of int... 0
checking for long double with more range or precision than double... no
checking for flex... /usr/bin/flex
checking for ar... ar
checking for bison... /usr/bin/bison
checking if readdir_r has 2 parms... no
checking if readdir_r has 3 parms... no
configure: PTRACE and all trace logging included
configure: Using ANSI C++ bool for PBoolean: (PFalse=false PTrue=true)
checking for recvmsg... no
checking for IPV6_ADD_MEMBERSHIP... no
checking for NetLink support... no
checking if using STL streams... no
checking if atomic integer available... no
checking if Unix semaphores are available... no
checking if named semaphores are available... no
configure: WARNING: This host does not support semaphores which are essential
configure: WARNING: to implement 'critical sections'. This feature was added
configure: WARNING: in PWLib 1.7.0 and improves the stability of multithreaded
configure: WARNING: programs. This feature has been disabled for this host
checking for pthread_create in -lpthread... no
configure: error: must have pthreads!

But if I do: whereis pthread.h
I get: /usr/include/pthread.h

So it seems that pthreads is installed. What am I doing wrong? 

Regards, and thank you in advance for your help.
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