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-rw-r--r--var/spack/repos/builtin/packages/flex/package.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/var/spack/repos/builtin/packages/flex/package.py b/var/spack/repos/builtin/packages/flex/package.py
index 0314950140..8f0c46bc56 100644
--- a/var/spack/repos/builtin/packages/flex/package.py
+++ b/var/spack/repos/builtin/packages/flex/package.py
@@ -44,7 +44,7 @@ class Flex(AutotoolsPackage):
depends_on('help2man', type='build')
# Older tarballs don't come with a configure script
- depends_on('m4', type='build', when='@:2.6.0')
+ depends_on('m4', type='build')
depends_on('autoconf', type='build', when='@:2.6.0')
depends_on('automake', type='build', when='@:2.6.0')
depends_on('libtool', type='build', when='@:2.6.0')