Lilypond wants FlexLexer

[Pierre Abbat <phma@xxxxxxxxxxxxx>]

I'm trying to install Lilypond. After installing a few other packages, it 
starts to build lilypond. It stops with the following:

checking texi2html version... 5.0
checking for dblatex... no
checking for pdflatex... pdflatex
checking for pngtopnm... no
checking for convert... convert
checking for zip... zip
checking for rsync... rsync
configure: creating ./config.status
config.status: creating config.make
config.status: creating config.hh
configure: WARNING: unrecognized options: --with-libintl-prefix

WARNING: Please consider installing optional programs:  dblatex pngtopnm

ERROR: Please install required programs:  FlexLexer.h (flex package)

See INSTALL.txt for more information on how to build LilyPond
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/print/lilypond
*** Error code 1

Stop.
bmake: stopped in /usr/pkgsrc/print/lilypond

So I check for flex:

# pkgin se flex
processing local summary...
updating database: 100%
aria2-1.12.1         Multi-threaded, multi-protocol, flexible download 
accelerator
atheme-3.0.4nb1      Flexible IRC services system with proven scalability
cfitsio-3.280 =      FITS (flexible image transport system) file input and 
output
flex-2.5.35nb2 =     Fast clone of lex(1), the lexical scanner generator
flexdock-0.5.1       Swing windowing and docking framework
getmail-4.22.1       Secure, flexible, reliable, easy-to-use fetchmail 
replacement
gnus-5.10.8          Gnus is a flexible message reader running under GNU Emacs
goofey-3.15          Text-based client for goofey, a flexible short message 
system
jflex-1.4.1          Fast lexical analyzer generator for Java
libctl-2.2nb7        Guile-based flexible control file library for scientific 
simulations
libggi-2.2.2         General Graphics Interface library is a flexible drawing 
library
log4shib-1.0.4nb1    C++ library for flexible logging, modeled after Log4j
p5-DBIx-Class-0.08123nb2  Extensible and flexible object <-> relational mapper
p5-DateTime-Format-Flexible-0.16nb1  Flexibly parse strings and turn them into 
DateTime objects
p5-Path-Dispatcher-0.15nb2  Perl 5 module providing flexible and extensible 
dispatch
prosody-0.8.2nb1     Flexible communications server for Jabber/XMPP written in 
Lua
ruby18-flexmock-0.9.0  Flexible mock object library for Ruby unit testing
ruby18-log4r-1.1.9   Flexible logging library
ruby18-logging-1.4.3  Flexible logging library for Ruby based on log4j
ruby18-simple-rss-1.2.3  Simple, flexible, extensible, and liberal RSS and 
Atom reader
ruby19-flexmock-0.9.0  Flexible mock object library for Ruby unit testing
ruby19-log4r-1.1.9   Flexible logging library
ruby19-logging-1.4.3  Flexible logging library for Ruby based on log4j
ruby19-simple-rss-1.2.3  Simple, flexible, extensible, and liberal RSS and 
Atom reader
solid-pop3d-0.15     Flexible POP3 server
tex-enctex-2009 =    TeX extension for flexible input/output reencoding
tex-geometry-5.6 =   Flexible and complete interface to document dimensions
tex-natbib-8.31b =   Flexible bibliography support for BibTeX
tex-xypic-3.8.5 =    Flexible diagramming macros

flex is installed. What am I missing?

Pierre
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