fix: tweaked Makefile for it to work on BSD systems

- On both FreeBSD and OpenBSD it's needed to explicitly link with
`pthread` (dynamic). On GNU/Linux does not affect this change.
- On OpenBSD the X11 headers are located in `/usr/X11R6/include`,
instead of in `/usr/include` as the rest of OSes, so the flag for the
preprocessor to find headers there has been added. On the rest of the
systems does not affect this change.

GNUmakefile

@@ -99,9 +99,10 @@ else
   STRIP_OPTS           = -s
 endif
 define RAYLIB_CPPFLAGS
-  $(DISABLE_ASSERTS_OPTS)    \
-  -D PLATFORM_DESKTOP        \
-  -isystem $(RAYLIB_SRC_DIR) \
+  $(DISABLE_ASSERTS_OPTS)        \
+  -D PLATFORM_DESKTOP            \
+  -isystem /usr/X11R6/$(HDR_DIR) \
+  -isystem $(RAYLIB_SRC_DIR)     \
   -isystem $(RAYLIB_SRC_DIR)/external/glfw/$(HDR_DIR)
 endef
 define CPPFLAGS
@@ -118,7 +119,7 @@ define RAYLIB_CFLAGS
   $(RELEASE_OPTS)
 endef
 define CFLAGS
-  -std=c17          \
+  -std=c11          \
   -Wall             \
   -Wextra           \
   -pedantic         \
@@ -134,6 +135,7 @@ define LDFLAGS
   -L $(LAUNCHER_BUILD_DIR) \
   -lraylib                 \
   -lsk_launcher            \
+  -lpthread                \
   -lm                      \
   -static-libgcc
 endef

README.org

@@ -108,6 +108,8 @@ You should have received a copy of the GNU General Public License along with Spa
     - [[#fedora][Fedora]]
     - [[#arch][Arch]]
     - [[#gentoo][Gentoo]]
+    - [[#freebsd][FreeBSD]]
+    - [[#openbsd][OpenBSD]]
 
 * Project's Roadmap
 
@@ -152,10 +154,10 @@ git clone --recurse-submodules https://github.com/iWas-Coder/sparky
 
 These are the packages needed to be able to build /Sparky/ from source, they are divided by distribution/package manager. Also, a command for each one is added to make the installation of these development dependencies as easy and straightforward as possible.
 
-- ~gcc~
-- ~rustc~
-- ~cargo~
 - ~make~
+- ~gcc~
+- ~rust~
+- ~jq~
 - ~libX11~
 - ~libXcursor~
 - ~libXrandr~
@@ -165,23 +167,36 @@ These are the packages needed to be able to build /Sparky/ from source, they are
 *** Debian/Ubuntu
 
 #+begin_src sh
-sudo apt install -y gcc rustc cargo make libx11-dev libxcursor-dev libxrandr-dev libxinerama-dev libxi-dev
+sudo apt install -y make gcc rustc jq libx11-dev libxcursor-dev libxrandr-dev libxinerama-dev libxi-dev
 #+end_src
 
 *** Fedora
 
 #+begin_src sh
-sudo dnf install -y gcc rust cargo make libX11-devel libXcursor-devel libXrandr-devel libXinerama-devel libXi-devel
+sudo dnf install -y make gcc cargo jq libX11-devel libXcursor-devel libXrandr-devel libXinerama-devel libXi-devel
 #+end_src
 
 *** Arch
 
 #+begin_src sh
-sudo pacman -S gcc rust make libx11 libxcursor libxrandr libxinerama libxi
+sudo pacman -S make gcc rust jq libx11 libxcursor libxrandr libxinerama libxi
 #+end_src
 
 *** Gentoo
 
 #+begin_src sh
-sudo emerge -va gcc rust-bin make libX11 libXcursor libXrandr libXinerama libXi
+sudo emerge -va make gcc rust-bin jq libX11 libXcursor libXrandr libXinerama libXi
+#+end_src
+
+*** FreeBSD
+
+#+begin_src sh
+sudo pkg install gmake gcc rust jq libX11 libXcursor libXrandr libXinerama libXi
+#+end_src
+
+*** OpenBSD
+
+#+begin_src sh
+sudo pkg_add gmake gcc rust jq
+sudo ln -s /usr/local/bin/x86_64-unknown-openbsd*-gcc-* /usr/local/bin/gcc
 #+end_src