I'm taking a look at the gr-ieee802-11 project. I'm unable to use 
ofdm_loopback.grc because ofdm_phy_hier appears to be missing. I've installed 
gr-ieee802-11 and gr-foo from Bastian's github page. What step am I missing?

Thanks,
Sean

<<< Welcome to GNU Radio Companion v3.7.2-13-gf1904733 >>>

Loading: "ofdm_loopback.grc"
>>> Error: Block key "ofdm_phy_hier" not found in Platform - grc(GNU Radio 
>>> Companion)
>>> Error: Connection between ofdm_phy_hier_1(0) and foo_packet_pad_0(0) could 
>>> not be made.
                source block id "ofdm_phy_hier_1" not in block ids
>>> Error: Connection between blocks_add_xx_0(0) and ofdm_phy_hier_1(0) could 
>>> not be made.
                sink block id "ofdm_phy_hier_1" not in block ids
>>> Error: Connection between blocks_message_strobe_0(0) and 
>>> ieee802_11_ofdm_mac_0(0) could not be made.
                source key "0" not in source block keys
>>> Error: Connection between ofdm_phy_hier_1(1) and ieee802_11_ofdm_mac_0(1) 
>>> could not be made.
                source block id "ofdm_phy_hier_1" not in block ids
>>> Error: Connection between ieee802_11_ofdm_mac_0(1) and ofdm_phy_hier_1(1) 
>>> could not be made.
                sink block id "ofdm_phy_hier_1" not in block ids
>>> Error: Connection between ofdm_phy_hier_1(1) and 
>>> ieee802_11_ofdm_parse_mac_0(0) could not be made.
                source block id "ofdm_phy_hier_1" not in block ids
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