Have a problem when I try to run commands in Raster menu (Qgis 3.0.0-2, MacOsX 
10.11.6) :

 Processing algorithm…
AlgorithmDialog
Input parameters:
{ 'INPUT' : '/Volumes/Mapas/Ráster/0158_fot_37430_etrs89_UTM_hu29.ecw', 'BAND' 
: 1, 'Z_FACTOR' : 1, 'SCALE' : 1, 'AZIMUTH' : 315, 'ALTITUDE' : 45, 
'COMPUTE_EDGES' : False, 'ZEVENBERGEN' : False, 'COMBINED' : False, 
'MULTIDIRECTIONAL' : False, 'OPTIONS' : '', 'OUTPUT' : 
'/var/folders/pm/c423kdzx2ms3fblh9gcvggx40000gn/T/processing_f8d608b88ccf4e22a875f55f00d48e2a/3a81f3494608410487ed10c9bcb8696d/OUTPUT.tif'
 }

GDAL command:
gdaldem hillshade /Volumes/Mapas/Ráster/0158_fot_37430_etrs89_UTM_hu29.ecw 
/var/folders/pm/c423kdzx2ms3fblh9gcvggx40000gn/T/processing_f8d608b88ccf4e22a875f55f00d48e2a/3a81f3494608410487ed10c9bcb8696d/OUTPUT.tif
 -of GTiff -b 1 -z 1.0 -s 1.0 -az 315.0 -alt 45.0
GDAL command output:
/bin/sh: gdaldem: command not found 
Execution completed in 0.10 seconds
Results:
{'OUTPUT': <QgsProcessingOutputLayerDefinition 
{'sink':/var/folders/pm/c423kdzx2ms3fblh9gcvggx40000gn/T/processing_f8d608b88ccf4e22a875f55f00d48e2a/3a81f3494608410487ed10c9bcb8696d/OUTPUT.tif,
 'createOptions': {'fileEncoding': 'System'}}>}

Loading the resulting layers
The following layers were not generated correctly.
/var/folders/pm/c423kdzx2ms3fblh9gcvggx40000gn/T/processing_f8d608b88ccf4e22a875f55f00d48e2a/3a81f3494608410487ed10c9bcb8696d/OUTPUT.tif


I follow all William instructions to install: Python first, GDAL after and last 
QGIS. Any idea where is the problem? This behavior is the same with other 
commands (change gdaldem for  /bin/sh: pct2rgb.py: command not found  or  
/bin/sh: gdal_polygonize.py: command not found )

TIA
Jesus
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