Compile error ESP32

I've had a ESP32 running for ages and wanted to make a small change so I fired up Arduino IDE and get the following compile error

C:\Users\dave\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.6\cores\esp32\esp32-hal-spi.c: In function 'spiTransferBytesNL':
C:\Users\dave\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.6\cores\esp32\esp32-hal-spi.c:922:39: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
                 uint8_t * last_out8 = &result[c_longs-1];
                                       ^
C:\Users\dave\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.6\cores\esp32\esp32-hal-spi.c:923:40: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
                 uint8_t * last_data8 = &last_data;
                                        ^
msvcm90.dll could not be extracted!
Multiple libraries were found for "WiFiUdp.h"
 Used: C:\Users\dave\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.6\libraries\WiFi
 Not used: C:\Program Files (x86)\Arduino\libraries\WiFi
exit status -1
Error compiling for board ESP32 Dev Module.

This is on a WIndows 7 machine and nothing changed to Arduino IDE that I know of.

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