diff -ur poslib-1.0/README poslib-1.0-fbsd/README
--- poslib-1.0/README	2003-02-01 16:27:37.000000000 +0100
+++ poslib-1.0-fbsd/README	2003-08-02 15:45:22.000000000 +0200
@@ -14,6 +14,12 @@
   --enable-ccmalloc       Turn on ccmalloc memory profiler
   --enable-sqldns         Compile SQL-based DNS sever
 
+Poslib is by default built without compiler optimisations because they caused
+random crashes on some platforms. On some platforms, including Linux, they
+can be safely turned on, like this:
+
+  ./configure --with-cxxflags="-funsigned-char -O3"
+
 Sqldns does not currently work all that will and requires the dbconnect
 library, which can be found at http://dbconnect.sf.net.
 
diff -ur poslib-1.0/configure poslib-1.0-fbsd/configure
--- poslib-1.0/configure	2003-07-30 22:11:29.000000000 +0200
+++ poslib-1.0-fbsd/configure	2003-08-02 15:48:48.000000000 +0200
@@ -8343,7 +8343,7 @@
   withval="$with_cxxflags"
    CXXFLAGS="$withval"
 else
-   CXXFLAGS="-O3 -Wall -funsigned-char -D_REENTRANT"
+   CXXFLAGS="-O0 -Wall -funsigned-char -D_REENTRANT"
 
 fi;
 
@@ -9734,6 +9734,7 @@
       if test "x$pthread_ok" = "xyes"; then
         echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6
+        THREAD_LIBS="-pthread"
       else
         echo "$as_me:$LINENO: result: no. Now we will try some libraries." >&5
 echo "${ECHO_T}no. Now we will try some libraries." >&6
@@ -9793,7 +9794,7 @@
 echo "$as_me:$LINENO: result: $ac_cv_lib_pthread_pthread_create" >&5
 echo "${ECHO_T}$ac_cv_lib_pthread_pthread_create" >&6
 if test $ac_cv_lib_pthread_pthread_create = yes; then
-  THREAD_LIBS="-lpthread"
+   LDFLAGS="$LDFLAGS -lpthread"; THREAD_LIBS="-lpthread"
 else
   echo "$as_me:$LINENO: checking for pthread_create in -lc_r" >&5
 echo $ECHO_N "checking for pthread_create in -lc_r... $ECHO_C" >&6
@@ -9850,7 +9851,7 @@
 echo "$as_me:$LINENO: result: $ac_cv_lib_c_r_pthread_create" >&5
 echo "${ECHO_T}$ac_cv_lib_c_r_pthread_create" >&6
 if test $ac_cv_lib_c_r_pthread_create = yes; then
-  THREAD_LIBS="-lc_r"
+   LDFLAGS="$LDFLAGS -lc_r"; THREAD_LIBS="-lc_r"
 else
   { { echo "$as_me:$LINENO: error: *** Failed to find pthreads" >&5
 echo "$as_me: error: *** Failed to find pthreads" >&2;}