Hi erveryone, i have a little problem linking against my newly installed: boost_date_time library. I even don't know if this is the right place for this question because everything works fine so far in the past. 1. I never had problems compiling and linking this sources before (on 3 other systems). 2. The project also contains some other directories with some kind of commandline tools.    These tools also link against the regex and date_time libraries without any problems. Here is the part where the libs are defined in my Makefile.am libmodwscmi_la_CXXFLAGS = $(INCLUDES) $(PROJECT_INCLUDES) $(APR_CFLAGS) libmodwscmi_la_LDFLAGS  = $(LDADD) $(BOOST_LDFLAGS) $(LIB_BOOST_REGEX) $(LIB_BOOST_DATETIME) `$(APR1CONFIG) --link-ld --libs` libmodwscmi_la_LIBADD   = $(top_builddir)/utils/mysqlpp/libmysqlpp.la $(top_builddir)/utils/jwsmtp/libjwsmtp.la After compiling is complete the linker gets called by this command: g++  -fPIC -DPIC -shared -nostdlib /usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.7/crtbeginS.o  .libs/libmodwscmi_la-mod_wscmi.o .libs/libmodwscmi_la-mod_gsoap.o .libs/libmodwscmi_la-mod_utils.o .libs/libmodwscmi_la-mod_mysql.o .libs/libmodwscmi_la-md5.o .libs/libmodwscmi_la-regEx.o .libs/libmodwscmi_la-utils.o .libs/libmodwscmi_la-exception.o .libs/libmodwscmi_la-dateTime.o .libs/libmodwscmi_la-validator.o .libs/libmodwscmi_la-mysqlPool.o .libs/libmodwscmi_la-mysqlCons.o .libs/libmodwscmi_la-mysqlQueries.o .libs/libmodwscmi_la-sqlite3.o   -Wl,-rpath -Wl,/var/www/projects/mod_wscmi-1.0/utils/mysqlpp/.libs -Wl,-rpath -Wl,/var/www/projects/mod_wscmi-1.0/utils/jwsmtp/.libs -L/usr/local/lib -lboost_date_time -lboost_regex -L/usr/lib /usr/lib/libapr-1.so -L/usr/local/mysql/lib ../utils/mysqlpp/.libs/libmysqlpp.so ../utils/jwsmtp/.libs/libjwsmtp.so -L/usr/lib/gcc/x86_64-linux-gnu/4.7 -L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.7/../../.. -lstdc++ -lm -lc -lgcc_s /usr/lib/gcc/x86_64-linux-gnu/4.7/crtendS.o /usr/lib/gcc/x86_64-linux-gnu/4.7/../../../x86_64-linux-gnu/crtn.o  -pthread -O3 -Wl,-R/usr/local/lib   -pthread -Wl,-soname -Wl,libmodwscmi.so.0 -o .libs/libmodwscmi.so.0.0.0 As you can see above, both libraries are present: -lboost_date_time -lboost_regex. They also can be found on the harddrive (in /use/local/lib): ... -rw-r--r-- 1 root  136876 Nov 20 09:19 libboost_date_time.a lrwxrwxrwx 1 root      28 Nov 20 09:18 libboost_date_time.so -> libboost_date_time.so.1.52.0 -rwxr-xr-x 1 root   94337 Nov 20 09:18 libboost_date_time.so.1.52.0 ... -rw-r--r-- 1 root 2619610 Nov 20 09:19 libboost_regex.a lrwxrwxrwx 1 root      24 Nov 20 09:18 libboost_regex.so -> libboost_regex.so.1.52.0 -rwxr-xr-x 1 root 1251576 Nov 20 09:18 libboost_regex.so.1.52.0 ... The complete build runs fine! There are no errors or warnings but the fianlly library is unusable because: boost_date_time is not present. Ldd shows up something like this: ldd .libs/libmodwscmi.so.0.0.0         linux-vdso.so.1 =>  (0x00007fff17da4000)         libboost_regex.so.1.52.0 => /usr/local/lib/libboost_regex.so.1.52.0 (0x00007ff289006000)         libapr-1.so.0 => /usr/lib/libapr-1.so.0 (0x00007ff288db5000)         libmysqlpp.so.0 => /var/www/projects/mod_wscmi-1.0/utils/mysqlpp/.libs/libmysqlpp.so.0 (0x00007ff288b35000)         libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007ff288832000)         libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007ff288472000)         libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007ff28825c000)         libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff28803f000)         libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007ff287e39000)         libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007ff287c35000)         libmysqlclient.so.18 => /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 (0x00007ff2876f1000)         libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007ff2873f4000)         /lib64/ld-linux-x86-64.so.2 (0x00007ff2895e9000)         libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007ff2871dd000) Only libboost_regex.so.1.52.0 was linked in and i have absolutly no idea why: libboost_date_time does not show up. So maybe someone of the list can give me an adivse of what's is going on here. Thanks and greetings  Michael     --- E-Mail ist da wo du bist! Jetzt mit freenetMail ganz bequem auch unterwegs E-Mails verschicken. Am besten gleich informieren unter http://mail.freenet.de/mobile-email/index.html