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Unable to make RTL8723BE from rtlwifi_new

I'm attempting to fix an issue that others seem to have had - on my Lenovo Yoga 2 13, the wireless connection drops out after a few minutes, then requires Wifi to be switched off/on to reconnect.

I'm using https://github.com/lwfinger/rtlwifi_new and I attempt to run make in that directory, but this results in:

# make
make -C /lib/modules/3.19.8-100.fc20.x86_64/build M=/tmp/rtlwifi_new modules
make: *** /lib/modules/3.19.8-100.fc20.x86_64/build: No such file or directory.  Stop.
make: *** [all] Error 2

Here is some more information that I have seen put in other posts, that may be of use:

# lspci | grep Network
01:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter

# dmesg
[47806.249265] wlp1s0: authenticate with c8:d3:a3:d3:a4:33
[47806.269221] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 1/3)
[47806.469952] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 2/3)
[47806.671121] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 3/3)
[47806.872282] wlp1s0: authentication with c8:d3:a3:d3:a4:33 timed out
[47818.384206] wlp1s0: authenticate with c8:d3:a3:d3:a4:33
[47818.403959] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 1/3)
[47818.604712] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 2/3)
[47818.805891] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 3/3)
[47819.007056] wlp1s0: authentication with c8:d3:a3:d3:a4:33 timed out
[47830.520898] wlp1s0: authenticate with c8:d3:a3:d3:a4:33
[47830.540766] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 1/3)
[47830.741505] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 2/3)
[47830.942669] wlp1s0: direct probe to c8:d3:a3:d3:a4:33 (try 3/3)
[47831.039597] wlp1s0: aborting authentication with c8:d3:a3:d3:a4:33 by local choice (Reason: 3=DEAUTH_LEAVING)

I'll happily supply any further information that may be required, but at this stage I'd love to get this fixed. I'm currently tethering through my phone.