From 8b0dc944284def804b99bcee436f93d19b44c0da Mon Sep 17 00:00:00 2001
From: Mattia Verga <mattia.verga@tiscali.it>
Date: Thu, 1 Sep 2022 10:22:20 +0200
Subject: [PATCH] Make build parallel safe

---
 GUI/xephem/Makefile | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/GUI/xephem/Makefile b/GUI/xephem/Makefile
index ddfbef9..da10016 100644
--- a/GUI/xephem/Makefile
+++ b/GUI/xephem/Makefile
@@ -185,21 +185,23 @@ OBJS =			\
 	xephem.o	\
 	xmisc.o
 
-all: libs xephem xephem.1
+LIBRARIES := libip liblilxml libjpegd libpng libz
 
-xephem: $(INCS) $(OBJS)
+all: $(LIBRARIES) xephem xephem.1
+
+xephem: $(INCS) $(OBJS) $(LIBRARIES)
 	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)
 
 xephem.1: xephem.man
 	nroff -man $? > $@
 
-libs:
-	cd ../../libastro; make
-	cd ../../libip; make
-	cd ../../libjpegd; make
-	cd ../../liblilxml; make
-	cd ../../libpng; make
-	cd ../../libz; make
+libs: $(LIBRARIES)
+
+$(LIBRARIES): libastro
+	$(MAKE) --directory=../../$@
+
+libastro:
+	$(MAKE) --directory=../../$@
 
 clean:
 	rm -fr *.o ../../lib*/*.[ao]