slang: multiple fixes

Add a gentoo patch to fix the wicked slsh link line that ended in the
bizarre prefix/exec_prefix/DESTDIR trickery.
Also fixes:
http://autobuild.buildroot.net/results/c3f/c3fb5337a4bdf87baead64106427c4929241c58d/

Also be explicit with enabling/disabling libpng, pcre, readline and zlib
support since they get picked up from the host if header files are
around because of the problem known as "absolute paths" when trying to
autodetect.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/slang/slang-01-slsh-libs.patch

@@ -0,0 +1,17 @@
+Link against sources instead of installation paths that aren't DESTDIRed.
+Patch taken from gentoo portage, upstream status unknown, author
+probably Diego Pettenò.
+
+Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
+
+--- a/slsh/Makefile.in
++++ b/slsh/Makefile.in
+@@ -80,7 +80,7 @@
+ $(OBJDIR)/slsh_exe: $(OBJDIR)/slsh.o $(OBJDIR)/readline.o
+ 	$(CC) $(CFLAGS) $(OBJDIR)/slsh.o $(OBJDIR)/readline.o -o $(OBJDIR)/slsh_exe $(LDFLAGS) $(SRC_LIBS)
+ $(OBJDIR)/slsh: $(OBJDIR)/slsh.o $(OBJDIR)/readline.o
+-	$(CC) $(CFLAGS) $(OBJDIR)/slsh.o $(OBJDIR)/readline.o -o $(OBJDIR)/slsh $(LDFLAGS) $(INST_LIBS)
++	$(CC) $(CFLAGS) $(OBJDIR)/slsh.o $(OBJDIR)/readline.o -o $(OBJDIR)/slsh $(LDFLAGS) $(SRC_LIBS)
+ $(OBJDIR)/slsh.o: $(OBJDIR) slsh.c slsh.h config.h Makefile
+ 	cd $(OBJDIR) && $(CC) -c $(CFLAGS) $(SLANG_SRCINC) $(DEFS) $(SRCDIR)/slsh.c
+ $(OBJDIR)/readline.o: $(OBJDIR) readline.c slsh.h config.h Makefile

package/slang/slang.mk

@@ -13,27 +13,35 @@ SLANG_LICENSE_FILES = COPYING
 SLANG_INSTALL_STAGING = YES
 SLANG_MAKE = $(MAKE1)
 
-ifeq ($(BR2_PACKAGE_NCURSES),y)
-	SLANG_DEPENDENCIES = ncurses
+# Absolute path hell, sigh...
+ifeq ($(BR2_PACKAGE_LIBPNG),y)
+	SLANG_CONF_OPT += --with-png=$(STAGING_DIR)/usr
+	SLANG_DEPENDENCIES += libpng
+else
+	SLANG_CONF_OPT += --with-png=no
+endif
+ifeq ($(BR2_PACKAGE_PCRE),y)
+	SLANG_CONF_OPT += --with-pcre=$(STAGING_DIR)/usr
+	SLANG_DEPENDENCIES += pcre
+else
+	SLANG_CONF_OPT += --with-pcre=no
+endif
+ifeq ($(BR2_PACKAGE_ZLIB),y)
+	SLANG_CONF_OPT += --with-z=$(STAGING_DIR)/usr
+	SLANG_DEPENDENCIES += zlib
 else
-	SLANG_CONF_OPT = ac_cv_path_nc5config=no
+	SLANG_CONF_OPT += --with-z=no
 endif
 
-# The installation location of the slang library
-# does not take into account the DESTDIR directory.
-# So SLANG_INST_LIB is initialized with -L/usr/lib/
-# and slang may be linked with host's libdl.so (if any)
-# Therefore, we have to pass correct installation paths.
-SLANG_INSTALL_STAGING_OPT = \
-	prefix=$(STAGING_DIR)/usr \
-	exec_prefix=$(STAGING_DIR)/usr \
-	DESTDIR=$(STAGING_DIR) \
-	install
+ifeq ($(BR2_PACKAGE_NCURSES),y)
+	SLANG_DEPENDENCIES += ncurses
+else
+	SLANG_CONF_OPT += ac_cv_path_nc5config=no
+endif
 
-SLANG_INSTALL_TARGET_OPT = \
-	prefix=$(STAGING_DIR)/usr \
-	exec_prefix=$(STAGING_DIR)/usr \
-	DESTDIR=$(TARGET_DIR) \
-	install
+ifeq ($(BR2_PACKAGE_READLINE),y)
+	SLANG_CONF_OPT += --with-readline=gnu
+	SLANG_DEPENDENCIES += readline
+endif
 
 $(eval $(autotools-package))