it turns out the issue can be solved by simply reordering the links on the commandline. Here a much simpler patch:
--- flightgear-2.0.0.orig/utils/propmerge/Makefile.in 2010-02-17 17:13:29.000000000 +0100 +++ flightgear-2.0.0/utils/propmerge/Makefile.in 2011-08-18 22:42:31.307998498 +0200 @@ -196,7 +196,7 @@ top_builddir = @top_builddir@ top_srcdir = @top_srcdir@ propmerge_SOURCES = propmerge.cxx -propmerge_LDADD = -lsgprops -lsgxml -lsgio -lsgmisc -lsgdebug -lsgstructure +propmerge_LDADD = -lsgprops -lsgmisc -lsgxml -lsgio -lsgdebug -lsgstructure all: all-am .SUFFIXES:
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