A 75-year-old black rebel leader freed from prison because of failing health made his first public appearance Monday and warned other nations "not to be fooled by cosmetic change" in South Africa.

Zepheniah Mothopeng, freed Saturday along with ailing black nationalist Harry Gwala, also challenged President Pieter W. Botha to legalize the outlawed Pan-Africanist Congress and African National Congress, two movements leading underground campaigns against minority white rule.Appearing for the first time as PAC leader at a news conference in the black township of Soweto outside Johannesburg, Mothopeng defied strict limits on public protest, urging foreign governments to tighten anti-apartheid pressure against Pretoria.

"I am calling on the international community not to be fooled by cosmetic change," he said, reading a prepared statement with occasional difficulty.