Gentoo-bug: https://bugs.gentoo.org/show_bug.cgi?id=436990
Reported-by: lya Gordeev

Assign simple soname to library.
diff --git a/src/Makefile b/src/Makefile
index 18a28e8..1b16203 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3,13 +3,14 @@ PREFIX   ?= /usr
 BINDIR   ?= $(PREFIX)/bin
 LIBDIR   ?= ${PREFIX}/lib
 CXXFLAGS += -O2
+DYLIB_LDFLAGS ?= -Wl,-soname,libbdelta.so
 
 ALL_TARGETS = bpatch libbdelta.so bdelta
 
 all: $(ALL_TARGETS)
 
 libbdelta.so: libbdelta.cpp compatibility.h checksum.h file.h
-	$(CXX) -shared -fPIC $(CXXFLAGS) $(LDFLAGS) $< -o $@
+	$(CXX) -shared -fPIC $(CXXFLAGS) $(LDFLAGS) $(DYLIB_LDFLAGS) $< -o $@
 
 bdelta: bdelta.cpp bdelta.h compatibility.h file.h libbdelta.so
 	$(CXX) $< -o $@ $(CXXFLAGS) $(LDFLAGS) -L. -lbdelta