Take advantage of shared SyncTeX parser library

As of revision 34449 texlive builds  SyncTeX parser as library. We continue to
include the code until this patch is deployed on most major distributions.
Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>

Makefile

@@ -4,7 +4,7 @@ include config.mk
 include colors.mk
 include common.mk
 
-OSOURCE    = $(filter-out css-definitions.c, $(filter-out dbus-interface-definitions.c, $(wildcard *.c))) $(wildcard synctex/*.c)
+OSOURCE    = $(filter-out css-definitions.c, $(filter-out dbus-interface-definitions.c, $(wildcard *.c)))
 HEADER     = $(wildcard *.h) $(wildcard synctex/*.h)
 HEADERINST = version.h document.h macros.h page.h types.h plugin-api.h links.h
 
@@ -23,6 +23,22 @@ LIBS     += $(MAGIC_LIB)
 CPPFLAGS += -DWITH_MAGIC
 endif
 
+ifneq ($(WITH_SYSTEM_SYNCTEX),0)
+INCS   += $(SYNCTEX_INC)
+LIBS   += $(SYNCTEX_LIB)
+else
+INCS   += $(ZLIB_INC)
+LIBS   += $(ZLIB_LIB)
+SOURCE += $(wildcard synctex/*.c)
+
+ifeq (,$(findstring -Isynctex,${CPPFLAGS}))
+CPPFLAGS += -Isynctex
+endif
+ifeq (,$(findstring -DSYNCTEX_VERBOSE=0,${CPPFLAGS}))
+CPPFLAGS += -DSYNCTEX_VERBOSE=0
+endif
+endif
+
 ifneq ($(wildcard ${VALGRIND_SUPPRESSION_FILE}),)
 VALGRIND_ARGUMENTS += --suppressions=${VALGRIND_SUPPRESSION_FILE}
 endif
@@ -36,13 +52,6 @@ endif
 ifeq (,$(findstring -DLOCALEDIR,${CPPFLAGS}))
 CPPFLAGS += -DLOCALEDIR=\"${LOCALEDIR}\"
 endif
-ifeq (,$(findstring -Isynctex,${CPPFLAGS}))
-CPPFLAGS += -Isynctex
-endif
-ifeq (,$(findstring -DSYNCTEX_VERBOSE=0,${CPPFLAGS}))
-CPPFLAGS += -DSYNCTEX_VERBOSE=0
-endif
-
 
 OBJECTS  = $(patsubst %.c, %.o,  $(SOURCE)) dbus-interface-definitions.o css-definitions.o
 DOBJECTS = $(patsubst %.o, %.do, $(OBJECTS))

config.mk

@@ -33,6 +33,10 @@ GTK_PKG_CONFIG_NAME = gtk+-3.0
 # To disable support for the sqlite backend set WITH_SQLITE to 0.
 WITH_SQLITE ?= $(shell (pkg-config --atleast-version=3.5.9 sqlite3 && echo 1) || echo 0)
 
+# synctex
+# To use the embedded copy of the syntex parser set WITH_SYSTEM_SYNCTEX to 0.
+WITH_SYSTEM_SYNCTEX ?= $(shell (pkg-config synctex && echo 1) || echo 0)
+
 # mimetype detection
 # To disable support for mimetype detction with libmagic set WITH_MAGIC to 0.
 WITH_MAGIC ?= 1
@@ -77,11 +81,16 @@ MAGIC_INC ?=
 MAGIC_LIB ?= -lmagic
 endif
 
+ifneq ($(WITH_SYSTEM_SYNCTEX),0)
+SYNCTEX_INC ?= $(shell pkg-config --cflags synctex)
+SYNCTEX_LIB ?= $(shell pkg-config --libs synctex)
+else
 ZLIB_INC ?= $(shell pkg-config --cflags zlib)
 ZLIB_LIB ?= $(shell pkg-config --libs zlib)
+endif
 
-INCS = ${GIRARA_INC} ${GTK_INC} ${GTHREAD_INC} ${GMODULE_INC} ${GLIB_INC} $(ZLIB_INC)
-LIBS = ${GIRARA_LIB} ${GTK_LIB} ${GTHREAD_LIB} ${GMODULE_LIB} ${GLIB_LIB} $(ZLIB_LIB) -lpthread -lm
+INCS = ${GIRARA_INC} ${GTK_INC} ${GTHREAD_INC} ${GMODULE_INC} ${GLIB_INC}
+LIBS = ${GIRARA_LIB} ${GTK_LIB} ${GTHREAD_LIB} ${GMODULE_LIB} ${GLIB_LIB} -lpthread -lm
 
 # flags
 CFLAGS += -std=c99 -pedantic -Wall -Wno-format-zero-length -Wextra $(INCS)