Compilation error on Arch Linux

[lukmi15]

Hi,

I followed the guide from here on my Arch Linux box: hxxps[://]wiki[.]mudlet[.]org/w/Compiling_Mudlet#Compiling_on_Arch_Linux (defang cause I am not allowed to post links to different domains)
but ran into the following error at the step

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make -j `nproc`

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g++ -c -pipe -O3 -std=gnu++1z -pthread -flto -fno-fat-lto-objects -Wall -Wextra -D_REENTRANT -fPIC -DBUILD_IRC_CORE -DBUILD_IRC_MODEL -DBUILD_IRC_UTIL -DINCLUDE_VARIABLE_SPLASH_SCREEN -DAPP_VERSION=\"4.18.3\" -DAPP_BUILD=\"-dev-9c921d19\" -DAPP_TARGET=\"mudlet\" -DINCLUDE_FONTS -DINCLUDE_UPDATER -DINCLUDE_3DMAPPER -DINCLUDE_OWN_QT5_KEYCHAIN -DINCLUDE_MAIN_BUILD_SYSTEM -DDEBUG_TELNET=1 -DLUA_DEFAULT_PATH=\"/usr/local/share/mudlet/lua\" -DQS_LOG_LINE_NUMBERS -DQTKEYCHAIN_NO_EXPORT -DLIBSECRET_SUPPORT -DHAVE_LIBSECRET -DKEYCHAIN_DBUS -DQT_NO_DEBUG -DQT_UITOOLS_LIB -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -DQT_MULTIMEDIA_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CONCURRENT_LIB -DQT_DBUS_LIB -DQT_CORE_LIB -I../src -I. -I../3rdparty/communi/src/core -I../3rdparty/communi/include/IrcCore -I../3rdparty/communi/src/model -I../3rdparty/communi/include/IrcModel -I../3rdparty/communi/src/util -I../3rdparty/communi/include/IrcUtil -I/usr/include/lua5.1 -I../3rdparty/discord/rpc/include -I../3rdparty/edbee-lib/edbee-lib -I../3rdparty/edbee-lib/vendor/qslog -I../3rdparty/edbee-lib/vendor/onig -I../3rdparty/edbee-lib/vendor/onig/enc/unicode -I../3rdparty -I../3rdparty/qtkeychain -I../3rdparty/dblsqd -I/usr/include/libsecret-1 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/gio-unix-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/sysprof-6 -I/usr/include/tss2 -I/usr/include/qt -I/usr/include/qt/QtUiTools -I/usr/include/qt/QtOpenGL -I/usr/include/qt/QtWidgets -I/usr/include/qt/QtMultimedia -I/usr/include/qt/QtGui -I/usr/include/qt/QtNetwork -I/usr/include/qt/QtConcurrent -I/usr/include/qt/QtDBus -I/usr/include/qt/QtCore -I. -I. -I/usr/lib/qt/mkspecs/linux-g++ -o AliasUnit.o ../src/AliasUnit.cpp
In file included from ../src/TLuaInterpreter.h:31,
                 from ../src/Host.h:35,
                 from ../src/MudletInstanceCoordinator.h:23,
                 from ../src/mudlet.h:30,
                 from ../src/ActionUnit.cpp:31:
../src/TTrigger.h:37:10: fatal error: pcre.h: No such file or directory
   37 | #include <pcre.h>
      |          ^~~~~~~~
compilation terminated.
In file included from ../src/TLuaInterpreter.h:31,
                 from ../src/Host.h:35,
                 from ../src/AliasUnit.cpp:25:
../src/TTrigger.h:37:10: fatal error: pcre.h: No such file or directory
   37 | #include <pcre.h>
      |          ^~~~~~~~
compilation terminated.
make: *** [Makefile:7116: ActionUnit.o] Error 1
make: *** Waiting for unfinished jobs....
make: *** [Makefile:7201: AliasUnit.o] Error 1

I noticed that `pcre` is not installed on my system but `pcre2` is:

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$ pacman -Ss pcre                                                                                                                                                                                                                                                                                        
core/pcre 8.45-4                                                                                                                                                                                                                                                                                                              
    A deprecated library that implements Perl 5-style regular expressions                                                                                                                                                                                                                                                     
core/pcre2 10.44-1 [installed]                                                                                                                                                                                                                                                                                                
    A library that implements Perl 5-style regular expressions. 2nd version

Should it maybe added as dependency in the wiki?

Does anyone know how to fix this and can give me any help?

[SlySven]

You do need BOTH the original PCRE (version 8.x) as well as the PCRE2 (version 10.x) one - Mudlet's code uses the original (now unchanging) version whereas the Qt framework and the build process use the later PCRE2 library... I don't know whether ARCH packages the headers separately from the libraries in "development" type packages - if it does you will need the PCRE one as well; OTOH since pacman package search (I - and now Muldlet itself- uses the Windows "MSYS2+Mingw-w64" environment for Windows builds and that also uses "pacman") did not mention any other packages I guess they come in the main package...