diff --git a/src/msspec/spec/fortran/SConstruct b/src/msspec/spec/fortran/SConstruct
new file mode 100644
index 0000000..dc1ef60
--- /dev/null
+++ b/src/msspec/spec/fortran/SConstruct
@@ -0,0 +1,40 @@
+from sysconfig import get_config_var
+import os
+
+COMP_OPTS = ['-O2', '-ffast-math', '-fno-automatic']
+env = Environment(tools=['default', 'gfortran'], FORTRAN='gfortran', FORTRANFLAGS=" ".join(['-fPIC'] + COMP_OPTS))
+
+sources = {
+	'dim_mod_src'               : ['memalloc/dim_mod.f'],
+	'memalloc_src'              : ['memalloc/modules.f', 'memalloc/allocation.f'],
+	'cluster_gen_src'           : Glob('cluster_gen/*.f'),
+	'common_sub_src'            : Glob('common_sub/*.f'),
+	'renormalization_src'       : Glob('renormalization/*.f'),
+        'phd_se_noso_nosp_nosym_src': Glob('phd_se_noso_nosp_nosym/*.f'),
+        'phd_mi_noso_nosp_nosym_src': Glob('phd_mi_noso_nosp_nosym/*.f'),
+        'eig_common_src'            : Glob('eig/common/*.f'),
+        'eig_mi_src'                : Glob('eig/mi/*.f'),
+        'eig_pw_src'                : Glob('eig/pw/*.f')}
+
+objects = {}
+for k, v in sources.items():
+	objects[k.replace('_src', '_obj')] = env.Object(sources[k])
+	
+Requires(objects['memalloc_obj'], objects['dim_mod_obj'])
+
+
+suffix = get_config_var('EXT_SUFFIX')
+cmd = "f2py3 -I. " + " ".join([str(_) for _ in objects if str(_).endswith('.o')]) + f" -c -m $MODULENAME $SOURCE"
+
+shared_objects = {
+	'phd_se_noso_nosp_nosym': 'phd_se_noso_nosp_nosym/main.f',
+	'phd_mi_noso_nosp_nosym': 'phd_mi_noso_nosp_nosym/main.f',
+	'eig_mi'                : 'eig/mi/main.f',
+	'eig_pw'                : 'eig/pw/main.f',}
+modules = {}
+
+for k, v in shared_objects.items():
+	env['MODULENAME'] = k
+	modules[k] = env.Command(k + suffix, v, cmd)
+	Requires(modules[k], objects.values())
+