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-rw-r--r--var/spack/repos/builtin/packages/plumed/package.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/var/spack/repos/builtin/packages/plumed/package.py b/var/spack/repos/builtin/packages/plumed/package.py
index ad14b7d2cd..c6be801b06 100644
--- a/var/spack/repos/builtin/packages/plumed/package.py
+++ b/var/spack/repos/builtin/packages/plumed/package.py
@@ -79,6 +79,7 @@ class Plumed(AutotoolsPackage):
depends_on('autoconf', type='build')
depends_on('automake', type='build')
depends_on('libtool', type='build')
+ depends_on('m4', type='build')
depends_on('py-cython', type='build', when='@2.5:')
force_autoreconf = True