Debian release of PCRE 4.5 had

 PCRE_LIB_VERSION=13:0:10

 PCRE_POSIXLIB_VERSION=13:0:10

 which corresponds to latest debian-revision (soname libpcre.so.3,

 installed as libpcre.so.3.9.0) and followed the instructions about version

 numbering in the libtool manual:

 |  3. If the library source code has changed at all since the last

 |     update, then increment REVISION (`C:R:A' becomes `C:r+1:A').

 13:1:10

   4. If any interfaces have been added, removed, or changed since the

      last update, increment CURRENT, and set REVISION to 0.

 14:0:10

   5. If any interfaces have been added since the last public release,

      then increment AGE.

 14:0:11

   6. If any interfaces have been removed since the last public release,

      then set AGE to 0.

 n/a

 Therefore I'm using 14:0:11 for this release of PCRE 5.0

--- pcre-6.3.orig/configure.in

+++ pcre-6.3/configure.in

@@ -38,8 +38,8 @@

 dnl Provide versioning information for libtool shared libraries that

 dnl are built by default on Unix systems.

-PCRE_LIB_VERSION=0:1:0

-PCRE_POSIXLIB_VERSION=0:0:0

+PCRE_LIB_VERSION=15:0:12

+PCRE_POSIXLIB_VERSION=15:0:12

 PCRE_CPPLIB_VERSION=0:0:0

 dnl Handle --disable-cpp

--- pcre-6.3.orig/configure

+++ pcre-6.3/configure

@@ -1514,8 +1514,8 @@

 POSIX_MALLOC_THRESHOLD=-DPOSIX_MALLOC_THRESHOLD=10

-PCRE_LIB_VERSION=0:1:0

-PCRE_POSIXLIB_VERSION=0:0:0

+PCRE_LIB_VERSION=15:0:12

+PCRE_POSIXLIB_VERSION=15:0:12

 PCRE_CPPLIB_VERSION=0:0:0

--- pcre-6.3.orig/pcreposix.h

+++ pcre-6.3/pcreposix.h

@@ -109,10 +109,15 @@

 /* The functions */

-extern int regcomp(regex_t *, const char *, int);

-extern int regexec(const regex_t *, const char *, size_t, regmatch_t *, int);

-extern size_t regerror(int, const regex_t *, char *, size_t);

-extern void regfree(regex_t *);

+extern int pcreposix_regcomp(regex_t *, const char *, int);

+extern int pcreposix_regexec(const regex_t *, const char *, size_t, regmatch_t *, int);

+extern size_t pcreposix_regerror(int, const regex_t *, char *, size_t);

+extern void pcreposix_regfree(regex_t *);

+

+#define regcomp pcreposix_regcomp

+#define regexec pcreposix_regexec

+#define regerror pcreposix_regerror

+#define regfree pcreposix_regfree

 #ifdef __cplusplus

 }   /* extern "C" */