[Chicken-hackers] use host PCRE to build the Debian package

[Ivan Shmakov]

        Currently, the Debian package for Chicken is being built with
        the binaries statically linked to the embedded copy of PCRE.
        Since I expect for Debian to do its best on supporting its own
        PCRE package, I suggest changing the build system to link
        against the host version of PCRE for building the Debian
        package.

        The following should be the essential part of the change.  The
        `debian/control' file should also be changed to properly state
        the newly introduced dependency (namely, `libpcre3-dev'.)

        There should probably be a separate Make variable to allow easy
        linking with host PCRE, like:

LINK_WITH_EMBEDDED_PCRE=yes
ifneq ($(LINK_WITH_EMBEDDED_PCRE),yes)
LIBRARIES       += -lpcre
PCRE_INCLUDES   ?=
C_COMPILER_PCRE_OPTIONS ?=
PCRE_OBJECTS_1 =
endif

        This variable could be used to eliminate `pcre/pcre.h' from the
        list of dependencies of the certain rules within `rules.make'.

        The following patch doesn't require such a variable.

diff --git a/debian/rules b/debian/rules
index 6ea008e..5fd7804 100644
--- a/debian/rules
+++ b/debian/rules
@@ -21,7 +21,20 @@ build: build-stamp
 build-stamp:
        dh_testdir
 #      CFLAGS="$(CFLAGS)" ./configure --prefix=/usr 
--mandir=\$${prefix}/share/man --infodir=\$${prefix}/share/info
-       $(MAKE) MAKEINFO_PROGRAM_OPTIONS="" CFLAGS="$(CFLAGS)" 
PREFIX="$(PREFIX)" MANDIR="$(PREFIX)/share/man" INFODIR="$(PREFIX)/share/info" 
SHAREDIR="$(PREFIX)/share" EGGDIR="/var/lib/chicken/$(BINARYVERSION)" 
MAKEINFO_PROGRAM_OPTIONS= HOSTNAME=debian
+       $(MAKE) \
+               MAKEINFO_PROGRAM_OPTIONS="" \
+               CFLAGS="$(CFLAGS)" \
+               LIBRARIES="-lm -ldl -lpcre" \
+               PCRE_INCLUDES= \
+               C_COMPILER_PCRE_OPTIONS= \
+               PCRE_OBJECTS_1= \
+               PREFIX="$(PREFIX)" \
+               MANDIR="$(PREFIX)/share/man" \
+               INFODIR="$(PREFIX)/share/info" \
+               SHAREDIR="$(PREFIX)/share" \
+               EGGDIR="/var/lib/chicken/$(BINARYVERSION)" \
+               MAKEINFO_PROGRAM_OPTIONS= \
+               HOSTNAME=debian
        touch build-stamp
 
 clean: