build errors an exi...
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build errors an existing example

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hello, I am new to platformio,i try to build the oled  from github website. from i have :

platform = espressif32
board = esp32dev
framework = espidf
monitor_baud = 115200

i follow exactly the instructions but after build the project i got the errors: undefined reference to `ssd1306_draw_string' and other functions in main.c have anybody any idea about this problem and how to solve them Thank you windows 10

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