diff --git a/Makefile.org b/Makefile.org
index ec96428..a28b469 100644
--- a/Makefile.org
+++ b/Makefile.org
@@ -255,7 +255,7 @@
 
 link-shared:
 	@ set -e; for i in ${SHLIBDIRS}; do \
-		$(MAKE) -f $(HERE)/Makefile.shared \
+		$(MAKE) -f $(HERE)/Makefile.shared -e $(BUILDENV) \
 			LIBNAME=$$i LIBVERSION=${SHLIB_MAJOR}.${SHLIB_MINOR} \
 			LIBCOMPATVERSIONS=";${SHLIB_VERSION_HISTORY}" \
 			symlink.$(SHLIB_TARGET); \
diff --git a/Makefile.shared b/Makefile.shared
index 1b14dd1..acee25c 100644
--- a/Makefile.shared
+++ b/Makefile.shared
@@ -196,10 +196,14 @@
 	fi; $(LINK_APP)
 
 # For Darwin AKA Mac OS/X (dyld)
+# link_o.darwin produces .so, because we let it use dso_dlfcn module,
+# which has .so extension hard-coded. One can argue that one should
+# develop special dso module for MacOS X. At least manual encourages
+# to use native NSModule(3) API and refers to dlfcn as termporary hack.
 link_o.darwin:
 	@ $(CALC_VERSIONS); \
 	SHLIB=lib$(LIBNAME); \
-	SHLIB_SUFFIX=.dylib; \
+	SHLIB_SUFFIX=.so; \
 	ALLSYMSFLAGS='-all_load'; \
 	NOALLSYMSFLAGS=''; \
 	SHAREDFLAGS="$(CFLAGS) $(SHARED_LDFLAGS)"; \
@@ -450,7 +454,7 @@
 	@if ${DETECT_GNU_LD}; then $(DO_GNU_SO); else \
 	$(CALC_VERSIONS); \
 	SHLIB=lib$(LIBNAME).sl; \
-	expr $(PLATFORM) : '.*ia64' > /dev/null && SHLIB=lib$(LIBNAME).so; \
+	expr "$(CFLAGS)" : 'DSO_DLFCN' > /dev/null && SHLIB=lib$(LIBNAME).so; \
 	SHLIB_SUFFIX=; \
 	ALLSYMSFLAGS='-Wl,-Fl'; \
 	NOALLSYMSFLAGS=''; \
diff --git a/engines/Makefile b/engines/Makefile
index b8fb1e9..2052b5f 100644
--- a/engines/Makefile
+++ b/engines/Makefile
@@ -84,6 +84,7 @@
 # XXXXX This currently only works on systems that use .so as suffix
 # for shared libraries as well as for Cygwin which uses the
 # dlfcn_name_converter and therefore stores the engines with .so suffix, too.
+# XXXXX This was extended to HP-UX dl targets, which use .sl suffix.
 install:
 	@[ -n "$(INSTALLTOP)" ] # should be set by top Makefile...
 	@if [ -n "$(SHARED_LIBS)" ]; then \
@@ -91,12 +92,18 @@
 		for l in $(LIBNAMES); do \
 			( echo installing $$l; \
 			  if [ "$(PLATFORM)" != "Cygwin" ]; then \
-				  cp lib$$l.so $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.so.new; \
+				case "$(CFLAGS)" in \
+				*DSO_DLFCN*)	sfx="so";;	\
+				*DSO_DL*)	sfx="sl";;	\
+				*)		sfx="bad";;	\
+				esac; \
+				cp lib$$l.$$sfx $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.$$sfx.new; \
 			  else \
-				  cp cyg$$l.dll $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.so.new; \
+			  	sfx="so"; \
+				cp cyg$$l.dll $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.$$sfx.new; \
 			  fi; \
-			  chmod 555 $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.so.new; \
-			  mv -f $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.so.new $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.so ); \
+			  chmod 555 $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.$$sfx.new; \
+			  mv -f $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.$$sfx.new $(INSTALL_PREFIX)$(INSTALLTOP)/lib/engines/lib$$l.$$sfx ); \
 		done; \
 	fi