Switch to gmake to hopefully prevent pkg-fallout errors that have been popping

up (specifically for math/fftw3-long), although, I can't reproduce them.

Making all in FAQ
restore=: && backupdir=".am$$" &&  am__cwd=`pwd` && CDPATH="${ZSH_VERSION+.}:"
&& cd . &&  rm -rf $backupdir && mkdir $backupdir &&  if (/bin/sh /wrkdirs/usr/
ports/math/fftw3-long/work/fftw-3.3.5/missing makeinfo --version) >/dev/null 2>&1;
then  for f in ./fftw3.info ./fftw3.info-[0-9] ./fftw3.info-[0-9][0-9]
./fftw3.i[0-9] ./fftw3.i[0-9][0-9]; do  if test -f $f; then mv $f $backupdir;
restore=mv; else :; fi;  done;  else :; fi &&  cd "$am__cwd";  if /bin/sh
/wrkdirs/usr/ports/math/fftw3-long/work/fftw-3.3.5/missing makeinfo   -I .
-o ./fftw3.info ./fftw3.texi;  then  rc=0;  CDPATH="${ZSH_VERSION+.}:" && cd .;
else  rc=$?;  CDPATH="${ZSH_VERSION+.}:" && cd . &&  $restore $backupdir/*
`echo "././fftw3.info" | sed 's|[^/]*$||'`;  fi;  rm -rf $backupdir; exit $rc
/wrkdirs/usr/ports/math/fftw3-long/work/fftw-3.3.5/missing: makeinfo: not found
WARNING: 'makeinfo' is missing on your system.
         You should only need it if you modified a '.texi' file, or
         any other file indirectly affecting the aspect of the manual.
         You might want to install the Texinfo package:
         <http://www.gnu.org/software/texinfo/>
         The spurious makeinfo call might also be the consequence of
         using a buggy 'make' (AIX, DU, IRIX), in which case you might
         want to install GNU make:
         <http://www.gnu.org/software/make/>
*** Error code 127

1 files changed, 1 insertions, 1 deletions

diff --git a/math/fftw3/Makefile b/math/fftw3/Makefile
index 5c5eb1648a55..a7b847a25615 100644
--- a/math/fftw3/Makefile
+++ b/math/fftw3/Makefile
@@ -23,7 +23,7 @@ FFTW3_SUFX=
 
 GNU_CONFIGURE=	yes
 INSTALL_TARGET=	install-strip
-USES=		libtool pathfix perl5 pkgconfig
+USES=		gmake libtool pathfix perl5 pkgconfig
 USE_PERL5=	build
 USE_LDCONFIG=	yes