Question: What South African politician formed a government of national unity with nelson Mandela's African National Congress and Mangosuthu Buthelezi's Inkatha Freedom Party?

Context paragraphs:
Inkatha Freedom Party: The Inkatha Freedom Party (IFP) is a political party in South Africa.  Since its founding, it has been led by Mangosuthu Buthelezi.  It is currently the fourth largest party in the National Assembly of South Africa, having lost almost half its seats and votes in the 2014 general election and yielding third place to the newly formed Economic Freedom Fighters.

Mangosuthu Buthelezi: Mangosuthu Buthelezi (born 27 August 1928) is a South African politician and Zulu tribal leader who founded the Inkatha Freedom Party (IFP) in 1975 and was Chief Minister of the KwaZulu bantustan until 1994.  He was Minister of Home Affairs of South Africa from 1994 to 2004.  His praise name is Shenge.

Magogo kaDinuzulu: Princess Constance Magogo Sibilile Mantithi Ngangezinye kaDinuzulu (1900–1984) was a Zulu Princess and artist, and mother to Chief Mangosuthu Buthelezi, Inkatha Freedom Party leader.

F. W. de Klerk: Frederik Willem de Klerk, DMS (] ; born 18 March 1936) is a South African politician who served as the country's State President from August 1989 to May 1994.  He was the seventh and last head of state of South Africa under the apartheid era.  De Klerk was also leader of the National Party (which later became the New National Party) from February 1989 to September 1997.

Siphiwe Mvuyane: Siphiwe Mvuyane was a South African police officer who died on 9 May 1993.  During the period of "low intensity warfare" in South Africa which largely pitted the African National Congress (ANC) and Inkatha Freedom Party (IFP), Siphiwe Mvuyane was on the side of the IFP.  During the period of the "low intensity warfare", the IFP was the sole ruling party of the Bantustan KwaZulu government, and worked in collaboration with the apartheid government, whereas the ANC was operating underground; as a result the IFP had an upper hand over the ANC when it came to the warfare.  But post apartheid, the African National Congress (ANC) became the governing party in South Africa whereas the Inkatha Freedom Party (IFP) became one of the opposition parties in the South African parliament, as a result the ANC gained the upper hand over the IFP in the remaining years of the warfare as the ANC was in control of the state apparatus by virtue of being the governing party.  The IFP leadership denied its involvement in sanctioning and orchestrating political violence in the furtherance of its political objectives during the period of the "low intensity warfare" in South Africa.

1994 in South Africa: 1994 in South Africa saw the transition from South Africa's National Party government who had ruled the country since 1948 and had advocated the apartheid system for most of its history, to the African National Congress (ANC) who had been outlawed in South Africa since the 1950s for its opposition to apartheid.  The ANC won a majority in the first multiracial election held under universal suffrage.  Previously, only white people were allowed to vote.  There were some incidents of violence in the Bantustans during the lead up to the elections as some of the leaders of the Bantusans did not want to participate in the elections, while some citizens there wanted to vote and become part of South Africa.  There were also bombings aimed at both the African National Congress and the National Party and politically-motivated murders of leaders of the opposing ANC and Inkatha Freedom Party (IFP).

Dakar Conference: The Dakar Conference (also known as the Dakar Dialogue and the Dakar Initiative) was a historic conference between members of the Institute for Democratic Alternatives in South Africa (IDASA) and the African National Congress (ANC).  It was held in Dakar, Senegal between 9 and 12 July 1987.  The conference discussed topics such as strategies for bringing fundamental change in South Africa, national unity, structures of the government and the future of the economy in a free South Africa.  The IDASA delegation from South Africa, participated in the conference in their private capacity and would later be condemned by the South African government for meeting a banned organization.  The future indirect result of the conference was South African government talks with Nelson Mandela and his eventual meeting with P. W. Botha in 1989.

1990 in South Africa: 1990 in South Africa saw the official start of the process of ending Apartheid.  President of South Africa, F.W. de Klerk announced plans to end apartheid.  President De Klerk unbanned organisations that were banned by the government including the African National Congress, the South African Communist Party and the Pan Africanist Congress.  The African National Congress' armed wing, Umkhonto we Sizwe, suspends its armed activity within South Africa.  Political prisoners including Nelson Mandela were released.  Nelson Mandela met ANC leader Oliver Tambo for the first time in 28 years at a meeting in Sweden.  Mandela also traveled to England to thank the people for their support in the campaign to free him.  South Africa withdrew its troops from Namibia, which was granted independence.  1990 also saw marches in support and against the formation of a new post-Apartheid South Africa.

22nd South African Parliament: The 22nd Parliament of the Republic of South Africa was elected in the elections of 27 April 1994; it was the first parliament in South Africa's history to be elected by voters of all races.  Nelson Mandela's African National Congress formed a government of national unity with F. W. de Klerk's National Party and Mangosuthu Buthelezi's Inkatha Freedom Party.  The three racially based houses from previous parliaments were replaced with the re-introduced Senate and National Assembly.  In 1997, on the introduction of the final Constitution, the Senate was replaced by the National Council of Provinces, which continues to serve as the upper house of South Africa's Parliament.

Cabinet of Nelson Mandela: Nelson Mandela took oath as President of South Africa on 10 May 1994 and announced his cabinet on 11 May 1994.  The cabinet included members of Mandela's African National Congress, National Party and Inkatha Freedom Party, as it was required by law that all parties winning more than 20 seats in the parliament be given representation in the cabinet.

Supporting paragraphs: 22nd South African Parliament F. W. de Klerk
Answer: Frederik Willem de Klerk