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diff --git a/rpy2/rinterface_lib/embedded.py b/rpy2/rinterface_lib/embedded.py
index cc32b6d..3969ad0 100644
--- a/rpy2/rinterface_lib/embedded.py
+++ b/rpy2/rinterface_lib/embedded.py
@@ -113,6 +113,16 @@ def _initr(interactive: bool = True,
if isinitialized():
return None
os.environ['R_HOME'] = openrlib.R_HOME
+
+ # path to libraries
+ existing = os.environ.get('R_LIBS_SITE')
+ if existing is not None:
+ prefix = existing + ':'
+ else:
+ prefix = ''
+ additional = '@NIX_R_LIBS_SITE@'
+ os.environ['R_LIBS_SITE'] = prefix + additional
+
options_c = [ffi.new('char[]', o.encode('ASCII')) for o in _options]
n_options = len(options_c)
n_options_c = ffi.cast('int', n_options)
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