Source based: pcsx_rearmed fails to compile

[ProxyCell]

I have tried to compile this twice on two different but "clean" systems:

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Getting sources for Playstation 1 LibretroCore
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Cloning into '/opt/retropie/emulatorcores/pcsx_rearmed'...
remote: Counting objects: 284, done.
remote: Compressing objects: 100% (272/272), done.
remote: Total 284 (delta 14), reused 205 (delta 1)
Receiving objects: 100% (284/284), 1.14 MiB | 1.05 MiB/s, done.
Resolving deltas: 100% (14/14), done.

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Building Playstation 1 LibretroCore
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/opt/retropie/emulatorcores/pcsx_rearmed /home/pi/RetroPie-Setup
please install libpng (libpng-dev)
rm -f pcsx libpcsxcore/cdriso.o libpcsxcore/cdrom.o libpcsxcore/cheat.o libpcsxcore/debug.o libpcsxcore/decode_xa.o libpcsxcore/disr3000a.o libpcsxcore/mdec.o libpcsxcore/misc.o libpcsxcore/plugins.o libpcsxcore/ppf.o libpcsxcore/psxbios.o libpcsxcore/psxcommon.o libpcsxcore/psxcounters.o libpcsxcore/psxdma.o libpcsxcore/psxhle.o libpcsxcore/psxhw.o libpcsxcore/psxinterpreter.o libpcsxcore/psxmem.o libpcsxcore/r3000a.o libpcsxcore/sio.o libpcsxcore/socket.o libpcsxcore/spu.o libpcsxcore/gte.o libpcsxcore/gte_nf.o libpcsxcore/gte_divider.o libpcsxcore/new_dynarec/emu_if.o plugins/dfsound/dma.o plugins/dfsound/freeze.o plugins/dfsound/registers.o plugins/dfsound/spu.o plugins/dfsound/out.o plugins/dfsound/nullsnd.o plugins/gpulib/gpu.o plugins/gpulib/vout_pl.o plugins/cdrcimg/cdrcimg.o plugins/dfinput/main.o plugins/dfinput/pad.o plugins/dfinput/guncon.o frontend/cspace.o frontend/main.o frontend/plugin.o pcsx.map frontend/revision.h
Please run ./configure before running make!
make: *** [config.mak] Error 1
Makefile:23: recipe for target 'config.mak' failed
/home/pi/RetroPie-Setup

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Configuring Playstation 1 LibretroCore
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[esconfedit.py] Successfully saved to file /etc/emulationstation/es_systems.cfg

[gizmo98]

Please install libpng-dev with
"sudo apt-get install libpng-dev"
and try again.

[ProxyCell]

I also had to install libx11-dev along with that libpng-dev. it appears to work now :)