From owner-freebsd-current@FreeBSD.ORG  Mon May 27 17:10:48 2013
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Date: Mon, 27 May 2013 19:10:37 +0200
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Subject: bsd.qt.mk "(cc --version [...])"
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There is no cc executable in the path (eg., there is no /usr/bin/cc) and the CC make-variable is set to an absolute path to the C compiler (Clang) in /etc/make.conf. Then, for example,

   cd /usr/ports/www/seamonkey && make config

results in the following output:

   make: "/usr/ports/Mk/bsd.qt.mk" line 313: warning: Couldn't read shell's output for "(cc --version 2> /dev/null | /usr/bin/awk 'NR == 1 { gsub(/[()]/, "", $2); print $2 }') || echo "gcc""

TODO: fix.