It seems that leif is not built, try doing

make rebuild install

and then

lyssa

Yes, now it did compile, but crashing at the start:

~/lyssa on git main underwent 22s781ms> lyssa
[LEIF ERROR]: Failed to open font file '/home/user/.leif/assets/fonts/inter.ttf'

[1] 2784 segmentation fault (core dumped) lyssa

Stack trace of thread 2784:
#0 0x000079220c4b9157 fseek (libc.so.6 0x7f157)
#1 0x0000585812de38a1 load_font (lyssa 0x9f8a1)
#2 0x0000585812de58b2 lf_load_font_asset (lyssa 0xa18b2)
#3 0x0000585812de5929 lf_default_theme (lyssa 0xa1929)
#4 0x0000585812de5c66 lf_init_glfw (lyssa 0xa1c66)
#5 0x0000585812d535c3 main (lyssa 0xf5c3)
#6 0x000079220c45fcd0 n/a (libc.so.6 0x25cd0)
#7 0x000079220c45fd8a __libc_start_main (libc.so.6 0x25d8a)
#8 0x0000585812d55d55 _start (lyssa 0x11d55)

i added the .leif folder to the install make script so if you clone again and folder the installation instructions, everything should work fine.

No luck,

~/lyssa on git main > lyssa
[LEIF ERROR]: Failed to open font file '/home/user/.leif/assets/fonts/inter.ttf'

[1]    8424 segmentation fault (core dumped)  lyssa
~/lyssa on git main x ls -l /home/user/.leif/assets/fonts/inter.ttf
-rw-r--r-- 1 user users 547120 Mar 27 08:36 /home/user/.leif/assets/fonts/inter.ttf

did you reclone the repo? and if yes, did you do make install?

if you did both, manually copy (lyssa dir)/vendor/leif/.leif into ~ (home dir)

Yes, I reclone-d again this repo and did mare rebuild. I've tried with make install, and still the same isseu.
The thing is that font actually exists on the filesystem:

[LEIF ERROR]: Failed to open font file '/home/user/.leif/assets/fonts/inter.ttf'

[1]    2969219 segmentation fault (core dumped)  lyssa

~/lyssa on git main x ls -l /home/user/.leif/assets/fonts/inter.ttf
-rw-r--r-- 1 user users 547120 Mar 31 10:56 /home/user/.leif/assets/fonts/inter.ttf

and user have all permission to that file.

Trying to trace all system calls when starting the app, and noticed this:

openat(AT_FDCWD, "/home/user/.leif\3/assets/fonts/inter.ttf", O_RDONLY) = -1 ENOENT (No such file or directory)
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0), ...}) = 0
write(1, "[LEIF ERROR]: Failed to open fon"..., 82[LEIF ERROR]: Failed to open font file '/home/user/.leif/assets/fonts/inter.ttf'
) = 82
write(1, "\n", 1
)                       = 1
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} ---
    killed by SIGSEGV (core dumped)    
[1]    2969706 segmentation fault (core dumped)  strace lyssa

not sure what \3 means here, maybe that's the problem?

i already built lyssa on multiple arch systems and never got this kind of issue. you could try to fopen() the font file in another c file and test if it works there. but one issue that i know is that leif cannot start because of a outdated graphics driver. you could try updating your driver and see if it works. also you can try to compile a c program that starts a glfw window, updates it etc. (https://www.glfw.org/documentation.html) and after glfwMakeContextCurrent, call lf_init_glfw(width, height, glfw_win); and check the output.

Yes, I reclone-d again this repo and did mare rebuild. I've tried with make install, and still the same isseu. The thing is that font actually exists on the filesystem:

[LEIF ERROR]: Failed to open font file '/home/user/.leif/assets/fonts/inter.ttf'

[1]    2969219 segmentation fault (core dumped)  lyssa

~/lyssa on git main x ls -l /home/user/.leif/assets/fonts/inter.ttf
-rw-r--r-- 1 user users 547120 Mar 31 10:56 /home/user/.leif/assets/fonts/inter.ttf

and user have all permission to that file.

Trying to trace all system calls when starting the app, and noticed this:

openat(AT_FDCWD, "/home/user/.leif\3/assets/fonts/inter.ttf", O_RDONLY) = -1 ENOENT (No such file or directory)
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0), ...}) = 0
write(1, "[LEIF ERROR]: Failed to open fon"..., 82[LEIF ERROR]: Failed to open font file '/home/user/.leif/assets/fonts/inter.ttf'
) = 82
write(1, "\n", 1
)                       = 1
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} ---
    killed by SIGSEGV (core dumped)    
[1]    2969706 segmentation fault (core dumped)  strace lyssa

not sure what \3 means here, maybe that's the problem?

getting the same error on my arch laptop, any update on this?

i already built lyssa on multiple arch systems and never got this kind of issue. you could try to fopen() the font file in another c file and test if it works there. but one issue that i know is that leif cannot start because of a outdated graphics driver. you could try updating your driver and see if it works. also you can try to compile a c program that starts a glfw window, updates it etc. (https://www.glfw.org/documentation.html) and after glfwMakeContextCurrent, call lf_init_glfw(width, height, glfw_win); and check the output.

I'm not too familiar with c, but with the help of ChatGPT I came up with the following application:

#include <stdio.h>

int main() {
    // Path to the file
    const char *file_path = "/home/user/.leif/assets/fonts/inter.ttf";
    
    // Open the file in read mode
    FILE *file = fopen(file_path, "rb");
    
    // Check if file opening was successful
    if (file == NULL) {
        perror("Error opening file");
        return 1; // Return with error status
    }
    
    printf("File opened successfully!\n");
    
    // Close the file
    fclose(file);
    
    return 0; // Return success
}

I compiled it and I got success running it:

gcc app.c -o fontapp
./fontapp
File opened successfully!

I tried to run this application and it run successfully:

int main(void)
{
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;

    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }

    /* Make the window's context current */
    glfwMakeContextCurrent(window);

    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT);

        /* Swap front and back buffers */
        glfwSwapBuffers(window);

        /* Poll for and process events */
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}

Compiled it:

gcc app3.c -o hello_world -lglfw -lGL -lX11 -lpthread -lXrandr -lXi -ldl

I'm using hyprland, not sure if that matters.

I also had the issue about the font loading for a long time but since the merge of this patch in the leif library, I don't encounter it anymore, you should try rebuilding it with the most up to date version of leif.

Yes, that works now. Thank you @xXDrkLeoXx !