--- ann_1.1.2/Make-config	2010-01-28 05:40:01.000000000 +0100
+++ ann_1.1.2.patched/Make-config	2021-01-19 11:05:59.300437367 +0100
@@ -68,6 +68,15 @@
 #-----------------------------------------------------------------------------
 
 #					Linux using g++
+
+linux-shared:
+	$(MAKE) targets \
+	"ANNLIB = libANN.so" \
+	"C++ = g++" \
+	"CFLAGS = -O3 -fPIC" \
+	"MAKELIB = gcc -shared -o" \
+	"RANLIB = true"
+
 linux-g++:
 	$(MAKE) targets \
 	"ANNLIB = libANN.a" \
--- ann_1.1.2/Makefile	2010-01-28 05:40:01.000000000 +0100
+++ ann_1.1.2.patched/Makefile	2021-01-19 11:10:45.817877672 +0100
@@ -56,7 +56,7 @@
 #-----------------------------------------------------------------------------
 # main make entry point
 #-----------------------------------------------------------------------------
-alpha-g++ macosx-g++ linux-g++ sgi sunos4 sunos4-g++ sunos5 sunos5-g++ sunos5-g++-sl authors-debug authors-perf:
+alpha-g++ macosx-g++ linux-g++ linux-shared sgi sunos4 sunos4-g++ sunos5 sunos5-g++ sunos5-g++-sl authors-debug authors-perf:
 	cd src ; $(MAKE) $@
 	cd test ; $(MAKE) $@
 	cd sample ; $(MAKE) $@