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-rw-r--r--var/spack/repos/builtin/packages/ncl/package.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/var/spack/repos/builtin/packages/ncl/package.py b/var/spack/repos/builtin/packages/ncl/package.py
index 4d9980ecc5..046dd9b3a8 100644
--- a/var/spack/repos/builtin/packages/ncl/package.py
+++ b/var/spack/repos/builtin/packages/ncl/package.py
@@ -144,7 +144,9 @@ class Ncl(Package):
c2f_flags.extend(['-lgfortran', '-lm'])
elif self.compiler.name == 'intel':
fc_flags.append('-fp-model precise')
- cc_flags.append('-fp-model precise')
+ cc_flags.append('-fp-model precise'
+ ' -std=c99'
+ ' -D_POSIX_C_SOURCE=2 -D_GNU_SOURCE')
c2f_flags.extend(['-lifcore', '-lifport'])
if self.spec.satisfies('%gcc@10:'):