https://codeberg.org/soundtouch/soundtouch/pulls/35
--- a/source/SoundTouchDLL/Makefile.am
+++ b/source/SoundTouchDLL/Makefile.am
@@ -34,7 +34,7 @@ libSoundTouchDll_la_SOURCES=../SoundTouch/AAFilter.cpp ../SoundTouch/FIRFilter.c
 # Compiler flags
 
 # Modify the default 0.0.0 to LIB_SONAME.0.0
-LDFLAGS=-version-info @LIB_SONAME@
+AM_LDFLAGS=$(LDFLAGS) -version-info @LIB_SONAME@
 
 if X86
 CXXFLAGS1=-mstackrealign -msse
@@ -44,4 +44,4 @@ if X86_64
 CXXFLAGS2=-fPIC
 endif
 
-CXXFLAGS+=$(AM_CXXFLAGS) $(CXXFLAGS1) $(CXXFLAGS2) -shared -DDLL_EXPORTS -fvisibility=hidden
+AM_CXXFLAGS=$(CXXFLAGS) $(CXXFLAGS1) $(CXXFLAGS2) -shared -DDLL_EXPORTS -fvisibility=hidden