Plain clone, build, run procedure segfaults on missing resources. I guess, it's not really nice behaviour.
$ valgrind --leak-check=full --track-origins=yes ./fheroes2
==13426== Memcheck, a memory error detector
==13426== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==13426== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==13426== Command: ./fheroes2
==13426==
03:16:49 PM: [ERROR] SetLangEnvPath: translation not found: en.po
03:16:49 PM: [ERROR] GetMaxMode: GetMaxMode: no modes available
03:16:49 PM: [ERROR] Open: Couldn't open dejavusans.ttf
==13426== Invalid read of size 8
==13426== at 0x5545E9A: TTF_SizeUNICODE (in /usr/lib/x86_64-linux-gnu/libSDL_ttf-2.0.so.0.10.1)
==13426== by 0x5547219: TTF_RenderUNICODE_Blended (in /usr/lib/x86_64-linux-gnu/libSDL_ttf-2.0.so.0.10.1)
==13426== by 0x40ED44: FontTTF::RenderUnicodeChar(unsigned short, RGBA const&, bool) const (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== by 0x43D81B: AGG::LoadTTFChar(unsigned int) (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== by 0x43DC2E: AGG::LoadFNT() (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== by 0x43E39B: AGG::Init() (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== by 0x5591C1: main (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==13426==
==13426==
==13426== Process terminating with default action of signal 11 (SIGSEGV)
==13426== at 0x6245428: raise (raise.c:54)
==13426== by 0x62454AF: ??? (in /lib/x86_64-linux-gnu/libc-2.23.so)
==13426== by 0x5545E99: TTF_SizeUNICODE (in /usr/lib/x86_64-linux-gnu/libSDL_ttf-2.0.so.0.10.1)
==13426== by 0x5547219: TTF_RenderUNICODE_Blended (in /usr/lib/x86_64-linux-gnu/libSDL_ttf-2.0.so.0.10.1)
==13426== by 0x40ED44: FontTTF::RenderUnicodeChar(unsigned short, RGBA const&, bool) const (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== by 0x43D81B: AGG::LoadTTFChar(unsigned int) (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== by 0x43DC2E: AGG::LoadFNT() (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== by 0x43E39B: AGG::Init() (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426== by 0x5591C1: main (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426==
==13426== HEAP SUMMARY:
==13426== in use at exit: 201,281 bytes in 1,258 blocks
==13426== total heap usage: 14,839 allocs, 13,581 frees, 3,328,539 bytes allocated
==13426==
==13426== 18 bytes in 2 blocks are definitely lost in loss record 20 of 475
==13426== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==13426== by 0x629B489: strdup (strdup.c:42)
==13426== by 0x6F9B596: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F9C5B4: _XimSetICValueData (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F97B68: _XimLocalCreateIC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F7D652: XCreateIC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x4E79BCC: ??? (in /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0.11.4)
==13426== by 0x4E7AB71: ??? (in /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0.11.4)
==13426== by 0x4E6C405: SDL_VideoInit (in /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0.11.4)
==13426== by 0x4E43E6B: SDL_InitSubSystem (in /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0.11.4)
==13426== by 0x4E43EE3: SDL_Init (in /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0.11.4)
==13426== by 0x40E4DE: SDL::Init(unsigned int) (in /home/zilvinas/Compile/fheroes2enh/build/fheroes2)
==13426==
==13426== 192 (16 direct, 176 indirect) bytes in 1 blocks are definitely lost in loss record 439 of 475
==13426== at 0x4C2FD5F: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==13426== by 0x6F831FC: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F83770: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8504E: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8587B: _XlcCreateLC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6FA265F: _XlcDefaultLoader (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8CE4D: _XOpenLC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8CF87: _XlcCurrentLC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8CFBD: XSetLocaleModifiers (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x4E79AF6: ??? (in /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0.11.4)
==13426== by 0x4E7AB71: ??? (in /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0.11.4)
==13426== by 0x4E6C405: SDL_VideoInit (in /usr/lib/x86_64-linux-gnu/libSDL-1.2.so.0.11.4)
==13426==
==13426== 192 (16 direct, 176 indirect) bytes in 1 blocks are definitely lost in loss record 440 of 475
==13426== at 0x4C2FD5F: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==13426== by 0x6F831FC: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F83770: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8504E: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8587B: _XlcCreateLC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6FA265F: _XlcDefaultLoader (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8CE4D: _XOpenLC (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F8D05A: _XrmInitParseInfo (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F74D3F: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F7835D: XrmGetStringDatabase (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F54D13: ??? (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426== by 0x6F54FBD: XGetDefault (in /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0)
==13426==
==13426== LEAK SUMMARY:
==13426== definitely lost: 50 bytes in 4 blocks
==13426== indirectly lost: 352 bytes in 8 blocks
==13426== possibly lost: 0 bytes in 0 blocks
==13426== still reachable: 200,879 bytes in 1,246 blocks
==13426== suppressed: 0 bytes in 0 blocks
==13426== Reachable blocks (those to which a pointer was found) are not shown.
==13426== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==13426==
==13426== For counts of detected and suppressed errors, rerun with: -v
==13426== ERROR SUMMARY: 4 errors from 4 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)
Plain clone, build, run procedure segfaults on missing resources. I guess, it's not really nice behaviour.
Valgrind dump: